Diving Knife
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SeaSwordSuperHardened Beta Titanium Dive Knife, 5” blade | ![]() |
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US $77.00 | 6h 28m |
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TUSA DIVE KNIFE | ![]() |
0 Bid | US $9.99 | 8h 32m |
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2 BLUE SCUBA DIVER DIVE KNIVES NAVY SEAL TYPE | ![]() |
0 Bid | US $17.99 | 10h 2m |
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2 YELLOW SCUBA DIVER DIVE KNIVES NAVY SEAL TYPE | ![]() |
0 Bid | US $17.99 | 10h 2m |
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BLUE & YELLOW SCUBA DIVER DIVE KNIVES NAVY SEAL TYPE | ![]() |
0 Bid | US $17.99 | 10h 2m |
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BLUE SCUBA DIVER DIVE KNIFE WITH SHEATH AND STRAPS | ![]() |
0 Bid | US $9.99 | 10h 3m |
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YELLOW SCUBA DIVER DIVE KNIFE WITH SHEATH AND STRAPS | ![]() |
0 Bid | US $9.99 | 10h 3m |
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Scuba Diving Knife w/ Sheath Leg & Arm Straps Diver Gear Dive Snorkeling Yellow | ![]() |
3 Bids | US $10.01 | 10h 21m |
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DIVE KNIFE WENOKA | ![]() |
2 Bids | US $9.99 | 11h 28m |
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Wenoka Blackie Collins Scuba Diving Snorkeling Knife 11" | ![]() |
5 Bids | US $8.22 | 13h 41m |
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Wenoka Auqa Lung Scubapro Scuba Diving Snorkeling Knife 12" & 9" | ![]() |
3 Bids | US $5.74 | 13h 51m |
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BLUNT TIP DIVE SCUBA DIVING KNIFE MCNETT BLACK SATURNA | ![]() |
0 Bid | US $19.89 | 14h 12m |
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Scuba Divers Snorkel Diving Dive knife Sharp 2 sided blades Fast Ship | ![]() |
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US $16.99 | 15h 5m |
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(NEW) Mini BC dive knife-drop point-scuba diving gear | ![]() |
1 Bid | US $13.99 | 16h 10m |
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VINTAGE SEA HUNTER DIVING KNIFE STAINLESS STEEL STAG .BONE HANDLE | ![]() |
1 Bid | US $20.00 | 1d 3h 18m |
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DEEP SEA DIVE KNIFE 4 1/4 IN | ![]() |
0 Bid | US $15.00 | 1d 6h 47m |
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Smith & Wesson S&W Aquanaut Dive Knife Scuba Diving Leg/Vest | ![]() |
14 Bids | US $19.50 | 1d 6h 54m |
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WEONKA DIVE KNIFE | ![]() |
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US $7.50 | 1d 11h 4m |
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UNDERWATER DIVING KNIFE MCNETT SAMISH DOUBLE EDGE NEW | ![]() |
0 Bid | US $19.45 | 1d 12h 2m |
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Vintage DACOR Scuba Dive Knife / Tool | ![]() |
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US $36.95 | 1d 14h 35m |
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Scuba Pro 4.75" Scuba Dive Knife ("Thresher" model) with sheath and straps. | ![]() |
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US $60.00 | 1d 14h 54m |
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TUSA X-PERT DIVERS KNIFE DIVING SNORKLING KNIFE SCUBA KNIFE X-PERT BLUNT TIP | ![]() |
1 Bid | US $14.99 | 1d 15h 54m |
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9" Yellow/Grey SCUBA Diver's Diving Knife + 2 Arm/Leg Straps Serrated Push Open | ![]() |
0 Bid | US $12.97 | 1d 16h 5m |
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9" Blue/Grey SCUBA Diver's Diving Knife + 2 Arm/Leg Straps Rope Cutter Push Open | ![]() |
0 Bid | US $12.97 | 1d 16h 5m |
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TIGER SHARK DIVING KNIFE & SHEATH WITH RUBBER ARM OR LEG STRAPS | ![]() |
0 Bid | US $17.50 | 1d 16h 18m |
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Wenoka Diving Knife (7795) Made in Japan - with Sheath | ![]() |
1 Bid | US $14.99 | 1d 18h 52m |
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Scuba Diving Knife Sheath & BCD Dive Gear Straps Snorkeling Non-Slip Grip Yellow | ![]() |
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US $10.94 | 2d 6h 50m |
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"SEA HUNTER" DIVE KNIFE: "#522" SS BLADE, RUBBER GRIPS & SHEATH, 1960s VINTAGE | ![]() |
1 Bid | US $9.50 | 2d 10h 13m |
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Ocean Master Titanium Beta Alloy Scuba Dive Knife -5" Blade | ![]() |
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US $52.00 | 2d 11h 16m |
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Vintage PlayRight Dive Knife | ![]() |
0 Bid | US $18.50 | 2d 13h 28m |
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Diving Knife

Physical impossibilities of martial arts in Chinese movies?
I'm doing a project in physics class that explains why these feats in films are PHYSICALLY [as in, by the laws of physics] impossible. I want to address mainly the fighting scenes that happen in the trees, but also things like the knife throwing in House of Flying Daggers and diving for the sword in Crouching Tiger, Hidden Dragon.
Explanations, websites, formulas, laws, anything is helpful since there really isn't much out there on these movies. Thank you!
Let's just say gravity.
For every one of your examples, gravity is the answer.
In the Chinese fighting movies, the people end up flying entirely horizontally, just sort of suspended in midair. Unfortunately for them, gravity exerts a constant force upon each of us that prevents this. We accelerate downward at 9.8 m/s^2 any time we leave the earth's surface. Here are some things to think about in those movies:
1) When they jump, they go upward at a CONSTANT SPEED. This is impossible! They should be slowing down. There's no way they're exerting a force to keep a constant speed against earth's gravity.
2) Those knives... I have seen these movies where the knives fly thousands of feet before impaling someone. Gravity acts on those, too. Unless they are able to cover those thousands of feet in under a second, they will have fallen five feet in that second... missing their target. How sad!
3) This happens in more than those movies, but have you seen how people fly backward after being hit? The same thing. The way they fly totally horizontally through the air is impossible. You may also note that when hitting the ground they sometimes slide a hundred feet or so before stopping. They weren't going THAT fast... the friction force would have stopped them.
That's all I can really think of right now. Any time they're flying vertically or horizontally at a CONSTANT SPEED, it's against gravity, and it is wrong. Have you seen how softly some of these guys hit the ground after falling from a building? Laughable!
On that note, think of the impulse equation. Impulse is the change in momentum. When a person changes from even 10 m/s to 0, the force as they hit the ground is unreal.
I really really hope this stuff helps you and gives you food for thought. Take care, and good luck! Physics is fun.
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SeaSwordSuperHardened Beta Titanium Dive Knife, 5” blade | ![]() |
![]() |
US $77.00 | 6h 28m |
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TUSA DIVE KNIFE | ![]() |
0 Bid | US $9.99 | 8h 32m |
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2 BLUE SCUBA DIVER DIVE KNIVES NAVY SEAL TYPE | ![]() |
0 Bid | US $17.99 | 10h 2m |
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2 YELLOW SCUBA DIVER DIVE KNIVES NAVY SEAL TYPE | ![]() |
0 Bid | US $17.99 | 10h 2m |
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BLUE & YELLOW SCUBA DIVER DIVE KNIVES NAVY SEAL TYPE | ![]() |
0 Bid | US $17.99 | 10h 2m |
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BLUE SCUBA DIVER DIVE KNIFE WITH SHEATH AND STRAPS | ![]() |
0 Bid | US $9.99 | 10h 3m |
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YELLOW SCUBA DIVER DIVE KNIFE WITH SHEATH AND STRAPS | ![]() |
0 Bid | US $9.99 | 10h 3m |
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Scuba Diving Knife w/ Sheath Leg & Arm Straps Diver Gear Dive Snorkeling Yellow | ![]() |
3 Bids | US $10.01 | 10h 21m |
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DIVE KNIFE WENOKA | ![]() |
2 Bids | US $9.99 | 11h 28m |
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Wenoka Blackie Collins Scuba Diving Snorkeling Knife 11" | ![]() |
5 Bids | US $8.22 | 13h 41m |
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Wenoka Auqa Lung Scubapro Scuba Diving Snorkeling Knife 12" & 9" | ![]() |
3 Bids | US $5.74 | 13h 51m |
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BLUNT TIP DIVE SCUBA DIVING KNIFE MCNETT BLACK SATURNA | ![]() |
0 Bid | US $19.89 | 14h 12m |
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Scuba Divers Snorkel Diving Dive knife Sharp 2 sided blades Fast Ship | ![]() |
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US $16.99 | 15h 5m |
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(NEW) Mini BC dive knife-drop point-scuba diving gear | ![]() |
1 Bid | US $13.99 | 16h 10m |
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VINTAGE SEA HUNTER DIVING KNIFE STAINLESS STEEL STAG .BONE HANDLE | ![]() |
1 Bid | US $20.00 | 1d 3h 18m |
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DEEP SEA DIVE KNIFE 4 1/4 IN | ![]() |
0 Bid | US $15.00 | 1d 6h 47m |
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Smith & Wesson S&W Aquanaut Dive Knife Scuba Diving Leg/Vest | ![]() |
14 Bids | US $19.50 | 1d 6h 54m |
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WEONKA DIVE KNIFE | ![]() |
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US $7.50 | 1d 11h 4m |
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UNDERWATER DIVING KNIFE MCNETT SAMISH DOUBLE EDGE NEW | ![]() |
0 Bid | US $19.45 | 1d 12h 2m |
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Vintage DACOR Scuba Dive Knife / Tool | ![]() |
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US $36.95 | 1d 14h 35m |
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Scuba Pro 4.75" Scuba Dive Knife ("Thresher" model) with sheath and straps. | ![]() |
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US $60.00 | 1d 14h 54m |
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TUSA X-PERT DIVERS KNIFE DIVING SNORKLING KNIFE SCUBA KNIFE X-PERT BLUNT TIP | ![]() |
1 Bid | US $14.99 | 1d 15h 54m |
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9" Yellow/Grey SCUBA Diver's Diving Knife + 2 Arm/Leg Straps Serrated Push Open | ![]() |
0 Bid | US $12.97 | 1d 16h 5m |
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9" Blue/Grey SCUBA Diver's Diving Knife + 2 Arm/Leg Straps Rope Cutter Push Open | ![]() |
0 Bid | US $12.97 | 1d 16h 5m |
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TIGER SHARK DIVING KNIFE & SHEATH WITH RUBBER ARM OR LEG STRAPS | ![]() |
0 Bid | US $17.50 | 1d 16h 18m |
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Wenoka Diving Knife (7795) Made in Japan - with Sheath | ![]() |
1 Bid | US $14.99 | 1d 18h 52m |
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Scuba Diving Knife Sheath & BCD Dive Gear Straps Snorkeling Non-Slip Grip Yellow | ![]() |
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US $10.94 | 2d 6h 50m |
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"SEA HUNTER" DIVE KNIFE: "#522" SS BLADE, RUBBER GRIPS & SHEATH, 1960s VINTAGE | ![]() |
1 Bid | US $9.50 | 2d 10h 13m |
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Ocean Master Titanium Beta Alloy Scuba Dive Knife -5" Blade | ![]() |
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US $52.00 | 2d 11h 16m |
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Vintage PlayRight Dive Knife | ![]() |
0 Bid | US $18.50 | 2d 13h 28m |
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Dive Knife Titanium | ![]() |
7 Bids | US $10.00 | 2d 13h 29m |
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Dacor Scuba DIVE KNIFE With SHEATH | ![]() |
0 Bid | US $29.95 | 2d 13h 35m |
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Vintage TEKNA Scuba DIVE KNIFE With Case | ![]() |
3 Bids | US $33.00 | 2d 13h 44m |
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vintage PLAY RIGHT dive knife - SCUBA sheath - made in Japan 12.5" | ![]() |
0 Bid | US $7.65 | 2d 13h 47m |
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Ocean Edge Dive Knife | ![]() |
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US $77.00 | 2d 13h 52m |
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Vintage DACOR Scuba DIVE KNIFE & Case - Solingen, Germany | ![]() |
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US $46.95 | 2d 14h 5m |
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10" Yellow Fixed Blade SCUBA Diving Knife Arm Straps Rope Cutter Top Serrated | ![]() |
0 Bid | US $12.95 | 2d 16h 18m |
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10" Blue/Gray Fixed Blade SCUBA Diving Knife Arm Straps Rope Cutter Top Serrated | ![]() |
0 Bid | US $12.99 | 2d 16h 18m |
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SNORKEL/DIVING SET/ACCESSORIES:KNIFE,COMPASS,BOOTS | ![]() |
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US $180.00 | 2d 16h 51m |
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Survival knife : dagger fixed blade diving fishing hunting shooting serrated fun | ![]() |
0 Bid | US $6.80 | 2d 21h 12m |
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Scuba diving gear complete set (bc, regs, computer, wetsuit, mask, fins, knife) | ![]() |
5 Bids | US $325.11 | 18h 54m |
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Oceanic Spinner Dive Knife Blunt Tip | ![]() |
1 Bid | US $.99 | 3d 5h 13m |
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Oceanic Spinner Dive Knife Pointed Tip | ![]() |
3 Bids | US $6.50 | 3d 5h 14m |
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Oceanic large Dive Knife | ![]() |
1 Bid | US $.99 | 3d 5h 16m |
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Blue Tang large Dive Knife | ![]() |
1 Bid | US $.99 | 3d 5h 18m |
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Sharp Titanium Scuba Dive Snorkeling Spearfishing Knife | ![]() |
0 Bid | US $38.88 | 3d 7h 30m |
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SeaQuest dive knife | ![]() |
0 Bid | US $19.99 | 3d 7h 34m |
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WENOKA SEA STYLE BLACKIE COLLINS 8831 42 SS U.S.A. DIVE KNIFE WITH CASE MINT | ![]() |
0 Bid | US $19.99 | 3d 7h 41m |
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Scuba Diving, Snorkelling Knife with Visable Sheath | ![]() |
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US $20.53 | 13d 16h 3m |
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McNett Stainless Steel Dive Knife Blunt Tip Diving Tool | ![]() |
0 Bid | US $9.99 | 3d 8h 31m |
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Diving $13.99 Diving - Poster |
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Diving In $19.99 Alberto Ruggieri Diving In - Giclee Print |
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DIVING WITH ANDY: DIVING WITH ANDY $14.29 DIVING WITH ANDY: DIVING WITH ANDY |
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The Knife $5.49 The Knife |
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Knife $7.99 Knife |
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Diving Into Darkness $9.49 Diving Into Darkness |
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Diving Micronesia $14.15 Diving Micronesia |
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Swimming And Diving $21.28 Swimming And Diving |
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Diving Cozumel $14.15 Diving Cozumel |
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Diving The World $26.95 Diving The World |
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USMC Diving Knife
Beginners' Lessons for Scuba Diving Tours in Ecuador!
Most people get excited by looking through the aquatic life of aquarium. How fascinating to be in the water and enjoying a different feel all of a sudden? If you too have some aquatic query that gives you thrilling booze, come to the beaches and islands of Ecuador in your upcoming holidays. Being a complete adventurous and self-satisfying activity, water marine activities definitely lure your heart out. If you love scuba diving activities, there is a strong need to get a closer look of aquatic life.
Scuba diving is a perfect activity to make personal rendezvous with the underwater world and to unravel the real and hidden beauty of the nature. You can follow simple scuba diving lessons and enjoy submerging into a grand water body to feel the difference. Some people take it as a hobby whereas some take it a journey to meet the aquatic creatures of the world.
Following are some basic etiquettes of scuba diving activity:
• Wear scuba diving gloves but be careful not to touch everything. You might get stung through them hence be careful.
• Use diving knife for cutting netting in wrecks. You should not do anything to harm innocent creatures or things.
• Do not do anything that can endanger the lives of extreme fragile and certain marine life. It is a serious offense and you should indulge in any such activity in any case.
• Always remember, the silt and bottom parts of the ocean are more susceptible to your movement inside the sea.
Enjoy more but be careful!
About the Author
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El Fish
I have a diving knife encased in a big heavy brass sheath like the one in the 5th photo.It came from the Royal Navy Dockyard “HMS Malabar” in Bermuda where my father used to work in the machine shop.The knife handle is split due to corrosion of the metal shaft but otherwise in good condition.I wonder what it is worth?