The vessel, which began its dive towards the Titanic wreck on Sunday morning, lost contact with the research vessel Polar Prince an hour and 45 minutes into the dive, according to the US Coast Guard.
Adam Boulton writes that if the current prime minister is to live up to his promises of a more professional and honest politics, he must deal with the stench of the honours system - particularly rewards planned for the allies of his predecessors in Downing Street.