A couple more articles re the swarm tech....

A couple more articles re the swarm tech.

https://dronebelow.com/2018/04/09/underwater-drone-swarms-now-a-thing/

https://www.*.com.au/robot-swarm-aquabotix-swarmdiver-robots-2018-4

I could see these being used as not only recon devices but also potentially as mini torpedoes.

There's nothing else of this kind currently available. AI has become a massive focus of the worlds navies.

From one of the articles:

This new technology, known as “maritime swarming”, is very quickly becoming an area of focus for naval forces across the globe. Engineered to handle dynamic operational situations, including Intelligence, Surveillance, and Reconnaissance (ISR) missions and sophisticated, coordinated assaults through tracking, trailing and overwhelming targets, the technology has been through some initial military trials.