| 2026-02-28 | School houses? |
| 2022-04-06 | Coral-based ecosystems |
| 2021-06-23 | Underwater ecosystems |
| 2021-02-25 | Prime snorkeling spots |
| 2021-01-13 | Some barriers to entry in the shipping business? |
| 2020-02-22 | Perils for mariners |
| 2019-03-17 | Some endangered ecosystems |
| 2018-11-21 | Water hazards |
| 2018-06-06 | Navigation hazards |
| 2016-01-03 | Some protective barriers |
| 2015-05-01 | Locales for many schools |
| 2015-03-26 | Navigational hazards |
| 2012-09-22 | Settings of many schools |
| 2008-12-28 | Hull scrapers |
| 2007-10-10 | Marine hazards |
| 2006-08-24 | Coral groups |
| 2006-07-03 | Snorkeling destinations |
| 2005-04-10 | Locations for some schools |
| 2004-08-31 | Sailing hazards |
| 2004-07-12 | Coral ridges |
| 2003-05-07 | Marine dangers |
| 2002-07-19 | Shortens, as a sail |
| 2002-03-07 | Snorkeling areas |
| 1998-06-21 | Coral assemblies |