Yemen’s branch of al-Qaida, also known as Al-Qaida in the Arabian Peninsula, is considered to be the most dangerous in the world.

Ship’s captain, two crew members arrested in conjunction with the accident, which left more than 300 missing or dead.

As the hunt for Flight 370 hit the six-week mark, the Bluefin 21 unmanned sub began its seventh trip into the depths off the coast of western Australia.

Another three guides remained missing, and searchers were working quickly to find them in case weather conditions deteriorated.