The contract with BP Exploration (Caspian Sea) Limited runs for five years, with two one-year extensions at current market terms, and will primarily support the ACG and Shah Deniz II fields offshore Azerbaijan, it said.

No value for the contract was given in the statement. However, based on the company's average day rate for its core fleet disclosed in its third-quarter results, it would be worth around $541 million (£384.26 million) if both extensions are exercised, according to Reuters calculations.

Topaz will supply large anchor-handlers, platform supply vessels and emergency response and recovery vessels under the contract, the statement added.

(Reporting by David French; Editing by Kim Coghill)