The SeaOtter MK II is an autonomous underwater vehicle for general-purpose surveying, monitoring and sampling of the oceans. The system is designed to be operated autonomously and without operator intervention, based on pre-programmed survey parameters such as survey plan, depth, exclusion zones, and payload settings. The vehicle is able to carry a wide range of sensors including side scan sonar, sub-bottom profiler, multi-beam echosounder, ADCP, sampling equipment, camera and pipe/cable tracking equipment. The SeaOtter MK II’s mission management system, navigation system and payload systems are tightly integrated to make the system robust and yet flexible enough to perform a wide range of mission types. Hull The AUV has a modular construction. The front section contains safety and communication equipment. The central module contains the battery compartment and a payload section which is configurable to requirements. The aft section contains mission management, navigation and propulsion systems. Power The AUV has standard endurance of 24 hours at a survey speed of 4 knots and with the payload operating. The AUV is powered by lithium polymer batteries which can be swapped or re-charged while on deck. Recharge time is 4 hours.