can reach pressures of (or more) for milliseconds, which is sufficient pressure to lead to brittle fracture of mild steel. Evidence of failure by this mechanism was also found on the Derbyshire. Smith has documented scenarios where hydrodynamic pressure of up to or over 500 metric tonnes per square metre could occur. Memorials A bronze plaque was placed on the wreckage as a memorial to those who were lost. On 21 September 1980, the Bibby Line vessel Cambridgeshire held a memorial service for Derbyshire in the area the vessel was lost. The 20th anniversary of the vessel's loss was marked by a memorial service in Liverpool, England, which was attended by Deputy Prime Minister John Prescott, himself a former merchant seaman. Ten years later a memorial service was held in the vessel's home port of Liverpool on the 30th anniversary of Derbyshires loss. A permanent monument was dedicated on 15 September 2018 in the garden of the Church of Our Lady and Saint Nicholas, Liverpool. See also List of ship launches in 1976 List of shipwrecks in 1980 List of maritime disasters , an American bulk carrier lost in 1975 under similar circumstances Notes References External links (dead link, archived) – essay criticising the 2000 formal investigation – archived version of official inquiry website Shipwrecks in the Pacific Ocean Maritime incidents in 1980 Engineering failures Merchant ships of the United Kingdom Ore-bulk-oil carriers 1975 ships Ships built by Swan Hunter Ships built on the River Tees Ships lost with all hands September 1980 events in Asia