1.   Others said they scrambled atop the overturned hull and had to listen to the knocking of people imprisoned beneath them.

2.   Four of his shipmates were plucked from certain death by rescuers who cut their way through the overturned hull after hearing their desperate knocking.

3.   Navy frogmen were called in to search the overturned hull, where some passengers were feared trapped, but found it empty.

4.   Navy frogmen were called in to search the overturned hull on the river bed, where some passengers were feared trapped, but found it empty.