The operator of a Portsmouth-based barge has today been made to pay almost £111,000 in fines and costs after pleading guilty to a breach of maritime legislation. Serco Ltd. admitted an offence at Portsmouth Crown Court in relation to the health and safety of workers aboard the barge 1706, which is operated as part of a service contract with the U.K. Ministry of Defense. The primary function of the barge is to collect waste products from naval vessels when they were moored in Portsmouth. On July 6, 2011, barge 1706 was secured alongside a warship at Portsmouth Naval Base and was taking waste water from the vessel. A short while later, the crew started to smell the distinctive 'rotten eggs' odor of hydrogen sulphide (H2S).