Was just reading that the first submarine has joined the search, the British Royal Navy's HMS Tireless. Another British Royal Navy ship should arrive shortly.

There's mention of an Australian naval vessel outfitted with a "black box detector" supplied by the US. It's not stated explicitly in the article, but the implication seems to be that it took this long for this "black box detector" to be brought into this search. Granted, this is a remote search area to reach, but still, it's almost the end of the 30 day battery on the black box pinger!