Tidal Forces: Calculating D-Day

Daina Bouquin: A war is on.

It goes beyond the title with direct discussion of water, tide, tides, including: And you are standing in the dark.

1. 01You are on the roof of a building near Liverpool, wrapped in a heavy trench coat that's losing a fight against the damp, biting cold
2. 02You're up here because a Nazi propagandist on the radio has promised that by morning, this building, the Bidston Observatory, will be no more
3. 03Hourly measurements of water levels taken at ports and harbors across Britain and beyond