Related Clues:

• Order from a submarine captain
• Fixed fight finish
• Jump from a board above a pool
• Emulate an aquanaut
• Seedy hangout
• Explore a reef, say
• Whales should cross northern water
• Go in headfirst
• Ship on duty guards fishing area
• Walden, e.g
• One may be done from a cliff
• Traditional sight next to many a mill
• Plunge downwards
• Trip in car, overlooking right seedy club!
• Jump in headfirst, say