Ended up on the ocean floor

• Went down like a stone
• Submerged
• Holed, as a putt
• Pocketed, as a billiard ball
• Descended gradually
• Lost seaworthiness
• Dropped, maybe
• Dropped to the bottom of the lake
• Knocked in a pocket, in pool

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
past tense of sink (q.v.).