Board Thread:Off Topic/@comment-29684190-20191110024409/@comment-27144409-20191123012148

Underwater security isn't a problem at the ports. It's out in the deep blue where the big ones hide. A wire controlled torpedo is a bit much for a character (a vehicle is another story), especially since you either have to be a great multitasker, or hold position while steering it to the target.

If it's sound guided, then the wire is redundant as we don't have reason to believe that Grimm are created with innate countermeasures for a good torp.

With wind dust you might be able to make cavitating bullets, but it would be tricky and expensive.

Phantom might be able to help more, he came up with a specialized school for aquatic combat.