Historical clue formulations

• ___ Trench, deepest place in the 10-Down — 2022-09-27
• ___ Trench (deepest point on earth) — 2021-02-01
• Island group that includes Guam — 2012-02-19
• ___ Trench (earth's deepest depression) — 2011-01-23
• ___ Trench (deepest point on Earth's surface) — 2010-05-04
• Pacific island chain — 1997-05-02