Historical clue formulations

• Bases of shipbuilding — 2026-01-15
• Collapses, with "over" — 2025-08-17
• Falls (over) — 2020-10-07
• Starting points in shipbuilding — 2019-01-29
• Falls (over) — 2018-12-24
• Naval bases? — 2015-06-14
• They're laid down in shipyards — 2015-01-03
• Leans precariously — 2013-09-20
• Bases for boats — 2012-09-30
• Falls (over) — 2011-01-06
• Falls (over) — 2010-09-26
• Topples — 2010-01-03
• Falls (over) — 2008-10-30
• Boats' backbones — 2004-06-01
• Naval bases? — 2004-04-04
• Dirigible parts — 2003-09-12
• Falls (over) — 2002-10-19
• Hull parts — 2001-11-12
• Hull bottoms — 2000-12-04
• Dirigible parts — 1998-12-05
• Starting points in shipbuilding — 1998-05-18
• Ships' spines — 1997-07-23
• Naval bases? — 1997-01-17
• Ships, in poetry — 1995-09-03
• Falls (over) — 1993-12-24