Altera Infrastructure, a company that owns and manages assets used in the offshore industry, has signed an agreement to sell the Altera Shuttle Tankers, which has a fleet of 18 shuttles tankers used in Brazil, Canada and the North Sea, at Maistros Shiptrade Limited, a subsidiary of the shipping group Angelicoussis, which currently has a fleet of 144 ships and a order book of another 23 ships including three shuttle tankers. The transaction is expected to be completed during the first half of next year after the green light of market regulatory authorities.