Thank you, guys!
This ship was launched in 1964 as USNS Kellar:
During the hurricane Betsy in September 1965, still unfinished and unmanned, she was hit by a drifting crane barge and one or more merchant ships, got torn from moorings, rolled over and sank. A month later Kellar was finally refloated and town to a wharf for a reconstruction due to severe damage. Some of the major changes were extension of the superstructure, removal of the bow thruster and addition of an active powered rudder.
In 1972 she was transferred to Portugal under the Security Assistance Program as NRP Almeida Carvalho. Between then and the 1990's she conducted the most research surveys for both Navy and scientific community.