- Ordinary Seaman Thomas: We really have got the job haven't we? You won't change your mind?
- Lieutenant Crabb, R.N.V.R.: Not unless you change yours.
- Ordinary Seaman Thomas: Oh no, sir, but there is one small point I think I should mention...
- Lieutenant Crabb, R.N.V.R.: What's that?
- Ordinary Seaman Thomas: I can't swim!
- Leading Seaman Knowles: Did you say your name was Crabb, sir? Couldn't have much better one for this job really.