Which reminds me of Leuchars in the F4 days. There were spare war time underwing fuel tanks in wooden crates scattered around the peri-track, slowly rotting away. Visitors would sometimes ask what they were.
Floats, I would explain solemnly. In case of the runway being severely careered and unusable, the F4s could be winched up and a float placed under each wheel. The airfield would then be flooded from the estuary allowing the F4s to be flown off, the floats being dropped out to sea before the undercarriage was retracted......