Historical clue formulations

• Consideration when diving — 2026-08-13
• One of the three dimensions — 2026-02-23
• Part of a furniture measurement — 2023-11-12
• Profundity — 2022-05-04
• Swimming pool measurement — 2020-02-26
• Profundity — 2018-10-04
• What a plane lacks — 2017-08-24
• "Mark twain" measure — 2015-05-20
• Abyss — 2013-11-23
• Swimming pool statistic — 2013-05-27
• Pool measurement — 2013-05-14
• Sonar's measurement — 2010-01-06
• Pool measurement — 2006-09-19
• Sounding — 2006-05-06
• Bathysphere reading — 2006-03-17
• Third dimension — 2005-05-10
• Well statistic — 2003-10-31
• Pool measure — 2002-06-11
• The third "D" of 3-D — 1999-06-14
• The third dimension — 1996-10-14
• One of the three D's — 1994-11-23