The Spider Crab is the latest is deep sea exploration drones. Unlike the exploration robots of the early twentieth century, this drone does not need cables to supply power and live video feeds. Instead it relies on state-of-the-art fuel cells and wireless video transmission. The drone can dive to depths much deeper than any robot before it. They use two large thrusters to dive and surface but it also has small ballast tanks to move around ship wrecks without disturbing the artifacts. The four legs have padded feet to reduce damage to artifacts and cushion impact with the sea floor. It is also equipped with two grasping claws for bringing up artifacts.