It made the underwater vehicle is at risk that did not happen earlier amid waning hopes Bluefin - 21 will soon find MH370 debris .
Bluefin - 21 belongs to the U.S. Navy and has become the core search sonarnya MH370 in zones away about 2,000 km from Perth in Western Australia .
However, searching by Bluefin - 21 on the ocean floor uncharted automatic safety mechanism that disrupt the underwater vehicle when delivered to a depth of more than 4.5 km .
This Friday or fifth dive mission , Bluefin - 21 had to dive to depths of 4,695 feet or exceed the maximum limits .
" This is the first time the Bluefin - 21 is lowered into the depths , " said Marine Lt. Daniel S. Marciniak told Reuters .
" Dive into the depths as it creates residual risk to the device and is carefully monitored by the U.S. Navy and ( owner of Bluefin - 21 ) Phoenix International . "
Marciniak justify the search area has been narrowed Bluefin - 21 is based on further analysis of the early signals are believed to come from the black box MH370 .
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Authorities say a U.S. Navy statement that hunt by Bluefin - 21 would require two months is one , otherwise the vehicle centered in the area of underwater search has narrowed and more focused . Reuters