This is the Onyx NAUT: a modular amphibious system that can be used on quadruped robots for more challenging missions. It has an autonomous propulsion system for pre-programmed mission plans. It weighs 2lbs and has a speed of 3 knots. The below video shows it integrated with the Ghost Robotics V60.
This system has a rugged design to withstand harsh conditions. It has curved, V-hull, and flat bottom mounting platforms.
[HT]