HMS Ocean provided The Royal Navy with an amphibious helicopter carrier. The ship had the capacity to carry 12 EH101 Merlin and 6 Lynx helicopters The flight deck was 170 metres long and 32.6 metres wide, with 2 aircraft lifts.
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MS Ocean was sold to the Brazilian Navy and commissioned as BNS Atlántico (A-140) in June 2018.
In November 2020 it was reported by the Defesa Aerea Naval website that Atlántico (A-140) had been reclassified as a multipurpose aircraft carrier and was able to operate with fixed winged medium altitude long endurance unarmed aircraft.