Historical clue formulations

• Shipwreck's resting place, with "the" — 2024-12-22
• Bathymetry measurements — 2020-12-05
• Davy Jones's locker, with "the" — 2017-06-10
• Lowest part — 2016-03-20
• Ocean bottoms — 2014-08-04
• They're plumbed — 2012-11-17
• Core — 2002-11-29
• Ocean bottoms — 1998-02-23
• Bottommost area — 1994-10-18