Historical clue formulations

• Tank top? — 2025-11-05
• Dream up, as a plan — 2025-08-18
• Concoct, as a plan — 2024-01-15
• "Down the ___!" ("Bottoms up!") — 2023-11-07
• Way into a sub — 2022-05-10
• Come out of one's shell — 2018-05-09
• Emerge from an egg — 2011-06-20
• Opening in the Navy? — 2010-08-03
• Submarine egress — 2008-12-28
• Come out of one's shell — 2007-07-08
• Down the ___ — 2006-06-06
• Way belowdecks — 2003-10-19
• Come out of one's shell? — 2003-04-30
• Deck opening — 2001-03-01
• Devise, as a plot — 2000-12-25
• Get cracking, in a way — 1999-10-10
• "Down the ___!" (drinker's toast) — 1997-10-27
• Break out, in a way — 1996-11-03
• Trapdoor — 1995-03-09
• Concoct — 1994-10-31