US firm Covington & Burling has bagged a lead role advising the Spanish Government on a claim arising from the discovery last month of a shipwreck carrying treasure thought to be worth $500m (£252m) – thought to be the largest discovery of its kind.

The claim, filed against US marine explorers Odyssey Marine Exploration in the US Federal Admiralty Court last week (30 May), challenges the explorers’ rights to recover or possess any Spanish property from the sunken ship, which dates from the 17th century.