A UK mission to salvage $750m of gold and silver cargoes from World War I and II wrecks is back on track after problems with a couple of chartered OSVs.

Salvage company Britannia's Gold (BGL) had already delayed the Irish Sea operation earlier this year due to the rise in ship rates from 2017.

It had hoped to take advantage of lower levels in the fourth quarter and finally secured a vessel last month, which guaranteed 38 operational days, with the shipowner accepting all weather and systems failure risks.