Lighthouse keeper logs, especially during the pre-computer days, can be a good source of observations of unusual events observed in the surrounding seas. I am sure there are many unusual events that have occurred and been recorded.
TTD/QTBA/FU
1. Where are the old logs of the lighthouses that are no longer being manned?
2. Identify all of the lighthouses that have ever existed around the world;
3. Identify all private organizations and government agencies that focus on or focused on lighthouses;
4. Check Archivegrid and other archive databases for the term "lighthouse".
5. Check the archives of government agencies whose responsibility it was to maintain the lighthouses;
6. Check the state/provincial and national archives of countries for lighthouse keeper logs.