Type-37-U is a kind of anti-sub and ship weapon. You can grab it from the orange part and save it as subparts. The boat-thing around it is just a demonstration platform. Preferred to be dropped in the predicted path of the target at speed<1000mph and hight<1000 ft. Press 3 to drop and 4 to fire ( need to be done before sinking too deep into water, or the booms will disappear ) for this demonstration. If you put this onto your plane, you need to set detach group for your pylon as the charge won't detach itself. Although it's small, it packs the power of 5x boom50 and 2x boom25, so be careful not to jam your device when using it. If you have XML modding, you can change the firing button by click the piston inside the centre of the charge and change input from Activate4 to the group you want. Sorry that I couldn't make it explode at certain depth. If you have any problem, ask me in comment section. Hope you enjoy.