Some time back there was testing footage of a #UUV submersible drone* . Unclear what happened to that project, but a platform that could sneak up close, surface and launch a bunch of FPVs seems like it could be quite useful. Control is a question for UUV, but even if ran with a mast / snorkel profile could be quite a bit lower than the current USVs. Or use battery + IMU dead reckoning to get close to the target area