This interesting grenade, manufactured by Bulgarian firm ARCUS Co., is designed to combat frogmen. The AR476 is fired from standard 40mm launchers at the area where combat divers are suspected to be underwater. When the projectile hits the water, a time deployed fuse is activated.
Many thanks, again, to Lusaka for the photo and info.
IIRC from Mythbusters and other investigations, most supersonic bullets are smashed to pieces when they hit water. Pistol rounds work fine, and a 9mm will still be dangerous at 10m, whereas (as abc123 said) rifles are pretty useless unless you’re using them as boomsticks.
The grenades seem like a good idea, but I’ll be frank: how often are frogmen encountered? Last I heard there were a few incidents of them operating in the Cold War snooping on warships, but they’re a very rare problem. This grenade seems like a very niche solution to a very rare issue.
Now, grenade fishing on the other hand… 
0 
0sucks to be a combat diver!
0 0@abc123
Woodleigh is now selling hydrostatically stabilized (cavitating) bullets in several diameters… 0.308″ among them.
0 0You can’t even use modern bullets to pepper the water, they tried this at mythbusters and I think 5.56, 7.62×51 and .50 BMG failed to get more than 1 meter down.
0 0Great potential for a bit of fishing, too!
0 0This is actually a brilliant idea! It’s a lot better than peppering the water with MG fire.
0 0
sucks to be a combat diver!
IIRC from Mythbusters and other investigations, most supersonic bullets are smashed to pieces when they hit water. Pistol rounds work fine, and a 9mm will still be dangerous at 10m, whereas (as abc123 said) rifles are pretty useless unless you’re using them as boomsticks.
The grenades seem like a good idea, but I’ll be frank: how often are frogmen encountered? Last I heard there were a few incidents of them operating in the Cold War snooping on warships, but they’re a very rare problem. This grenade seems like a very niche solution to a very rare issue.
Now, grenade fishing on the other hand…
@abc123
Woodleigh is now selling hydrostatically stabilized (cavitating) bullets in several diameters… 0.308″ among them.
You can’t even use modern bullets to pepper the water, they tried this at mythbusters and I think 5.56, 7.62×51 and .50 BMG failed to get more than 1 meter down.
Great potential for a bit of fishing, too!
This is actually a brilliant idea! It’s a lot better than peppering the water with MG fire.