The Mulberry Harbour, also known as the Phoenix Caisson, lays on the seabed off of Thorpe Bay where it has been ever since it was being towed for the D Day landings 80 years ago.
The platform remains the property of the MOD but continues to attract visitors walking out to it, especially during warmer weather.
However, inexperienced people can find themselves in trouble as the tide flows in quickly, leading to an increase in calls to Southend Coastguard and Southend RNLI.
The Coastguard said: “We would like to remind anyone thinking of walking out to visit this historic feature of the dangers, if you are not familiar with our local tides and mudflats.”
They issued the following advice for anyone considering walking out to the Mulberry Harbour in Southend:
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