Artemis , a Bluefin-21 owned by Phoenix International , was used aboard ADV '' Ocean Shield '' in the search for the wreck of Malaysia Airlines Flight 370 by mapping the Zenith Plateau with a side-scan sonar , mapping 90 square kilometres a day . On its fifth mission , Artemis reached a depth of after failing to find any wreckage in the previous attempts . It is believed to have cost 1 million USD for this mission alone . On 22 April , it was reported that Artemis was on its ninth mission . Artemis was used on 25 missions over 21 operational days , accumulating 370 hours of search time while covering 250 square miles
Malaysia Airlines Flight 370
Malaysia Airlines Flight 370
Bluefin-21