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It is from this BBC page on landmarks being preserved from D-Day.

The body looks a bit like a Sherman, but the turret isn't like anything I've ever seen before.

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It's a Valentine tank:

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The Tank, Infantry, Mk III, Valentine was an infantry tank produced in the United Kingdom during the Second World War. More than 8,000 of the type were produced in eleven marks, plus various specialised variants, accounting for approximately a quarter of wartime British tank production.2 The many variants included riveted and welded construction, petrol and diesel engines and a progressive increase in armament. It was supplied in large numbers to the USSR and built under licence in Canada. Developed by Vickers, it proved to be both strong and reliable.

Combat History – Northwest Europe
By 1944, the Valentine had been almost replaced in front-line units of the European theatre by the Churchill tank (the "Infantry Tank Mark IV") and the US-made M4 Sherman tank. A few were used for special purposes or as command vehicles for units equipped with the Archer self-propelled gun. The Royal artillery used the Valentine XI (with 75mm gun) as an OP command tank right till the end of the war.

The location seems to be Poole Bay/Harbour in Dorset:

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The war tanks sunk during Operation Smash - a huge training exercise held on a Dorset beach in April 1944, just weeks ahead of the Normandy landings.

Six lives were lost during the drill - but a lesson was learned so that, on D-Day, British and Canadian tanks were launched in shallow water.

D-day rehearsal wrecks given protection before 75th anniversary. A Valentine tank in Poole Harbour. Photograph: Paul Pettitt:

Six weeks before 6 June 1944, troops rehearsed an assault codenamed Exercise Smash at Studland beach, Dorset, watched by Eisenhower, Winston Churchill and King George VI. Seven army tanks known as Duplex Drive (DD) Valentine tanks, modified to be amphibious tanks so they could leave their landing craft further from shore, were lost because of bad sea conditions. Six crew members died.

This is

@sempaiscuba: While the photograph was taken by (and copyright of) Paul Pettitt

Original story making the rounds seems to be from The Sun:

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Operation Smash 75 years on:

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Showing how these tanks would have looked before the exercise (and partially why they are where they are now.)

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    The photograph was taken by (and copyright of) Paul Pettitt – sempaiscuba Jun 3 at 10:56
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    a lesson was learned so that, on D-Day, British and Canadian tanks were launched in shallow water. But the US didn't listen, and so lost many tanks off of Omaha beach - iirc only two landed, the rest sunk because they were launched too far out in high seas and were swamped. – Baldrickk Jun 4 at 10:44

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