Related Clues:

• Could one get around at sea in a tub that's broken and will go down?
• That gets down to it in 18 down
• It's not natural to get to 'er before the weekends, perhaps, in short
• That'll get you down
• O, a tub that goes down
• But it's round around down below
• That's just unreal
• Former Atlantic ocean threat
• Craft, about weaving
• German military sub
• WW II shipping threat
• Artificial, not genuine
• Fake keepers at zoo, well concealed
• A note about a snake
• Substitute for the heart of conversations with final ending