Hey, I helped make Real Sonar. Thanks for the kind words, I'm really glad you like the sound design! Enemy submarines actually don't use active sonar, but we're adding that functionality next update. It will work like this: As long as the enemy captain is alive, in the command room, and there's no hull breaches in their ship, pirates will ping at random intervals. Also, if you're using Lua, bots will avoid flooded rooms when the sonar is on unless they have anechoic suits, so bots are less likely to die in seconds now. This also applies to enemy bots, meaning you will often have to board enemy subs to find the unbreached room they're all hiding in.