Related Clues:

• Descended
• Forced under water
• Beyond help
• Dropped to the bottom of the lake
• Dropped sharply
• Went down like a cement block
• Lost seaworthiness
• Made like the Titanic
• What the Lusitania did
• Brought to ruin
• Behaved like a lead balloon?
• Didn't stay up
• Torpedoed
• Lost altitude
• Dropped like an anchor