@osma@noelreports the idea for small submarines capable of carrying a small group of navy seals is nothing new. No need for deep diving capabilities, just not being visible above the waterline is already great. Speed and manoeuvrability are extra. You could build multiple versions of the same craft. One for carrying troops, one for launching rockets or torpedo's. Even a remotely operated one for self destructive missions would be capable of carrying a 1 ton explosive.