at sea for such long periods, habitability standards had to be of the highest quality, and an air conditioning plant, which provided drying and either heating or cooling of the air as appropriate for arctic or tropical service, was an important installation in the Porpoise Class.
Of the last exponents of the class, the Barrow built Porpoise was sunk as a target on 20th October 1985, whilst Rorqual was broken up in the same year, Sealion and Walrus were sold in. 1987 and Finwhale was broken up in the same year.
OBERON CLASS
Between 1959 and 1964, thirteen Oberon Class submarines were constructed for the Royal Navy, three of which - Olympus,
