A ship with a unique history. Sabotaged 10 June 1940 by British Commandos off Gibraltar and partially sunk, she was later surreptitiously raised by Italian Special Forces operating out of Algeciras and used as, firstly an observation post, and later as a launching base for human torpedoes.

Ref: https://en.wikipedia.org/wiki/Italian_auxiliary_ship_Olterra

https://en.wikipedia.org/wiki/Decima_Flottiglia_MAS

https://www.visit-andalucia.com/one_post.php?id=303&title=operation-ursa-major-an-italian-operation-to-sink-allied-shipping-at-gibraltar

Launched:22/5/2013 Completed:6/2013
4,973 gt. Length - 115.8m. Beam - 16.1m
Built by Palmer's Ship Building and Iron Works Co. Ltd., Hebburn, U.K.
1913 - "OSAGE" - Deutsch-Amerikansche Petroleum Ges., Hamburg, Germany
1914 - "BATON ROUGE" - Standard Oil Co. of New Jersey, New York, USA
1925 - "OLTERRA" - European Shipping Co. Ltd., London, UK
1927 - new owner British Oil Shipping Co. Ltd., London
1930 - new owner Andrea Zanchi, Genoa, Italy
1947 - renamed "EMMA".
1948 - name reverts to "OLTERRA"
1951 - new owner Ditta Andrea Zanchi, Genoa.
9/1/1961 - broken up at Savona, Italy.