PNW Arms is the latest company to develop a supercaptivating rifle bullet with the ability to deeply penetrate water. See this impressive demonstration …
To quote Wikipedia, supercavitation is “is the use of cavitation effects to create a bubble of gas inside a liquid large enough to encompass an object travelling through the liquid, greatly reducing the skin friction drag on the object and enabling achievement of very high speeds.”.
During the 70s, Russia developed torpedoes that used supercavitation which allowed them to travel much faster than would otherwise be possible. Since then Germany and Iran (or so they claim) have developed similar torpedoes.
[Hat Tip: Solider Systems]
[ Many thanks to Nugroho for emailing us the link. ]