"What do you think has become of her, Mr Trimble?" he demanded.  "She cannot have gone ashore and broken up so completely in a quarter of an hour that no sign of her would remain.  We should see something at least in the nature of wreckage to give us a hint of what had happened.  Yet I see nothing; although if she had been stranded, either purposely or by accident, her wreck ought to be away in there somewhere about abreast of us.  And there are no off-shore dangers, are there?"