Underwater UAV robot drone is more widely used in diving, marine exploration, rescure and fishing.
I want to recommend to you POSEIDON MINI underwater robot: GENEINNO POSEIDON, follows are mainly features:
120m deepwater with adjustable LED lights, Triple Thruster system, HD 1080p camera & DVR recomend PC/LOS/Andriod phone, WIFI control!
Live FPV stream DVR Store internally, Neutral buoyancy & software supported Stability, Omni-directional movement!

Full Kit of POSEIDON include:
1Xpacking case
1Xposeidon machine
1Xcable
1Xcharger
1Xbuoy
POSEIDON is a far-sighted product with exploration spirit.