The Arronax is a huge submarine and the home of the Nektons and its craftsmanship is the envy of other submariners worldwide. 

It is not only the largest and most effective ocean vessel on the entire planet, but it has a whole bunch of cool defense vehicles, energy-efficient technology, and is three times the size of a military submarine! It also has a state-of-the-art radar system and holographic screens that can connect to views of the outside world (in addition to 5 bedrooms, the moon pool, a library, and more – yep, there’s still Fontaine’s secret room that Ant hasn’t found – overall, pretty cool).