The Bluefin-21 is an autonomous underwater vehicle (AUV) developed by Bluefin Robotics for defence, commercial or scientific use.

[1] It has a modular design that can be adapted to carry a variety of sensors and payloads at one time, making it suitable for diverse deep-sea missions including offshore survey, marine salvage detection, marine archeology survey, oceanography, mine countermeasures, and the detection of unexploded ordnance.

This allows the robot to reach a top speed of 4.5 kn (8.3 km/h; 5.2 mph) and an endurance of 25 hours at 3 knots.

[6] On its fifth mission, Artemis reached a depth of 4,695 metres (15,404 ft) after failing to find any wreckage in the previous attempts.

[3] Artemis was used on 25 missions over 21 operational days, accumulating 370 hours of search time while covering 250 square miles.