WWII Slapton Sands disaster remembered (UK) - BBC News - 28th April 2019

75 years on, the disaster of Slapton Sands, which saw more than 700 U.S. serviceman training for D-Day were killed (many of them drowning), when fast German patrol boats caught them and errors by the Royal Navy meant the tragedy was larger than it should have been. The incident was hushed up at the time for morale issues, etc., as this was close to D-Day itself.