Related Clues:

• It's the depths when a director conceals it!
• 'The subterranean dark / Has crossed the -' (A. E. Housman)
• Saw British returning to base
• Part of Rouen - a dirty low point
• In short, William Golding's seamen's argot
• Drain constructed for lowest point
• Last cargo vessel?
• Athenian weaver (AMND)
• The pits in roads terrible? Not so bad!
• England reached it in Spain last week
• Given lowest place in navy, princess flipped
• Drain off into the depths
• British saying about mechanic, for instance
• Bottom of drain collapsing
• Lowest point of girl who's changed at last