A British nuclear submarine has joined the search for Malaysia Airlines Flight MH370 almost one month after the jet carrying 239 people first went missing. HMS Tireless, which has already arrived in the southern Indian Ocean, has advanced underwater search capabilities to the mission, according to the U.K.'s Ministry of Defense. It will join up to eight planes and nine ships searching area of around 86,000 square miles, located some 1,000 miles west-north-west of Perth, Australia.
