Historical clue formulations

• Bottomless pit — 2026-06-09
• Deep chasm — 2026-02-18
• Vast void — 2025-06-09
• Bottomless pit — 2024-12-31
• Deep chasm — 2024-03-12
• Bottomless chasm — 2023-11-29
• Bottomless well — 2023-05-09
• Bottomless pit — 2023-02-20
• Bottomless void — 2022-10-02
• Chasm — 2022-07-20
• Hell, to Dante — 2022-07-07
• Deep chasm — 2022-07-05
• Deep, dark hole — 2022-05-22
• Chasm — 2021-07-26
• Mariana Trench, e.g. — 2021-04-06
• Bottomless expanse — 2021-02-17
• Bottomless pit — 2020-08-31
• Bottomless hole — 2019-12-10
• It's no miniature gulf — 2019-08-21
• Chasm — 2019-08-18
• Wide gap — 2019-06-08
• Deep hole — 2019-05-05
• Deep, deep hole — 2018-07-15
• Deep, deep pit — 2018-05-16
• Bottomless pit — 2017-09-18
• Deep gulf — 2016-11-13
• No miniature gulf — 2016-07-24
• It's unfathomable — 2015-01-03
• Bottomless pit — 2014-11-10
• Bottomless void — 2013-05-06
• Chasm — 2011-08-09
• "Ghosts of the ___" (James Cameron documentary about the Titanic) — 2011-01-09
• Chasm — 2010-06-07
• Big gulf — 2009-11-29
• Bottomless pit — 2009-11-24
• Gaping hole — 2009-04-19
• Chasm — 2008-07-30
• Gulf — 2008-06-29
• Big cavity — 2007-03-04
• Deep gulf — 2007-01-21
• Chasm — 2006-08-29
• Chasm — 2005-05-30
• Gulf — 2004-02-15
• Bottomless chasm — 2003-12-23
• Tartarus, in Greek myth — 2003-02-28
• Deep pit — 2002-12-10
• Chasm — 2002-10-27
• Depths — 2002-06-21
• Infernal regions — 2000-03-19
• Yawning gulf — 2000-02-28