The US Coast Guard has said that they do not know what the "banging" noises heard coming from the area of the last known location of the missing Titanic submarine.<br /><br />A Canadian aircraft searching for the vessel heard sounds using sonar buoys on Tuesday which are now being assessed by experts.<br /><br />The underwater vehicle submerged on Sunday morning (18 June) and its support vessel lost contact with it about an hour and 45 minutes later, authorities said.<br /><br />The result of the “banging” noises heard by the Canadian P-3 was inconclusive but are being analysed further, Captain Jamie Frederick said on Wednesday.
