A World War Two wreck in the Thames estuary is a ticking time bomb, an expert has warned, as it has not been dealt with 80 years after the vessel first sunk.

The SS Richard Montgomery was carrying 7,000 tonnes of explosives and weapons when it grounded on the sandbank close to the Isle of Grain in August 1944.

A rescue effort took place to try and unload the ship’s cargo but a crack appeared in its hull and only half of the explosives were salvaged.

Professor David Alexander of University College London told the Standard the ship remains a “serious threat” and in a worse case scenario it could explode creating a five-metre tsunami up the Thames.