morning local time. the us coastguard also confirmed that more tapping noises were picked up by a canadian team overnight, but locating its source is extremely difficult. the submersible was on its way to visit the site of the titanic wreck, which lies some 12,500 feet underneath the ocean s surface. the international rescue operation for the sub is being coordinated in boston. with pressure growing to rescue those onboard there are now dozens of vessels scanning thousands of miles of ocean for any signs of the sub. our north america correspondent nomia iqbal reports from newfoundland. everything possible is being used to try and find the missing submersible. these are the first images of the complicated international hunt unfolding in the atlantic ocean more than 400 miles from the coast. it has now entered its most critical day. the sub, which is the size of a minivan, needs to be found before oxygen runs out for the men on board. but there is some hope, more noises have
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