Related Clues:

• Bob, Brad and Brian on television
• Carol's about to catch vehicle up in curious event
• 28's food item taking seconds to secure
• 21 7's creation, time which goes slowly?
• Submarine - mollusc
• Sluggish person - kind of mail
• Mollusc
• Shelled invertebrate
• Slow-moving 12
• Slow-moving garden pest
• Captain Nemo's submarine
• Usual tin for a small sea creature
• Creature with one foot
• Crawler whose home has a helix pattern
• First nuclear-powered sub