And where the first version used a syringe-pump ballast tank to control the depth, this one uses vertical thrusters. The flexible lid proved to be a problem with that scheme, since it tended to ...

There are three main challenges to building a submarine. These are the radio system, building a watertight enclosure, and having some sort of ballast tank to pump water into and out of.

A detailed model has provided what’s likely our best idea of how the U.K. Royal Navy’s new Dreadnought class nuclear ...