There seems to be some effort in Britain to publicize the Slapton Sands disaster in 1944

When I was sitting in Garfunkel's restaurant, at London Gatwick Airport, on the way back from Amsterdam, I talked with a couple from Plymouth, England. When the husband heard that I wrote about history, he asked me if I knew about the incident at Slapton Sands, during a practice for the Normandy invasion, in early 1944. I had not heard of it, as the cover-up has been very effective. There seems to be a concerted effort to publicize the disaster (for that was what it was). Marion Hoffman has a page about the incident.