Williamsburg was transferred to the National Science Foundation on 9 August 1962, undergoing a change from presidential yacht to oceanographic research vessel at the Woods Hole Oceanographic Institution.
During the overhaul, the presidential staterooms and other yacht-like trappings were removed, and special facilities installed.
Among the modifications was a seawater aquarium for preservation of live specimens and a lab equipped with microscopes and other instruments for examining and classifying samples of marine life.
Two winches and a small crane were fitted for dredging and deep sea work, while a small side deck platform was added to permit long line fishing.
The ship's engines, too, were reconditioned, and her bilge keels were modified to make the ship more stable.

Renamed Anton Bruun, in honor of the noted Danish marine biologist, the ship made ten scientific cruises in the Indian Ocean, conducting broad sample studies of bottom, midwater, and surface life.
She caught specimens of plankton; did long line fishing and trawling in deep water; conducted meteorological observations; and periodically obtained water samples.
A multinational assemblage of scientists from the United States, India, Thailand, Brazil, and Pakistan worked on board the ship during this cruise.

Upon the conclusion of the Indian Ocean expedition, Anton Bruun returned to the United States in February 1965.
Eight months later, she sailed for the Pacific Ocean to make a series of eight cruises in the Southeastern Pacific Oceanographic Program, conducting biological research in the area of the Humboldt Current and other areas of the southeastern Pacific.
Anton Bruun subsequently continued her oceanographic voyages until 1968.

During that year, while laid up for repairs in a floating drydock, the ship suffered extensive damage when the drydock sank unexpectedly.
Anton Bruun was slated to be transferred to the Indian government.
Restoration, in view of the apparent damage suffered in the drydock mishap, appeared uneconomical.
Williamsburg was transferred to the National Science Foundation on 9 August 1962, undergoing a change from presidential yacht to oceanographic research vessel at the Woods Hole Oceanographic Institution. During the overhaul, the presidential staterooms and other yacht-like trappings were removed, and special facilities installed. Among the modifications was a seawater aquarium for preservation of live specimens and a lab equipped with microscopes and other instruments for examining and classifying samples of marine life. Two winches and a small crane were fitted for dredging and deep sea work, while a small side deck platform was added to permit long line fishing. The ship's engines, too, were reconditioned, and her bilge keels were modified to make the ship more stable.
Renamed Anton Bruun, in honor of the noted Danish marine biologist, the ship made ten scientific cruises in the Indian Ocean, conducting broad sample studies of bottom, midwater, and surface life. She caught specimens of plankton; did long line fishing and trawling in deep water; conducted meteorological observations; and periodically obtained water samples. A multinational assemblage of scientists from the United States, India, Thailand, Brazil, and Pakistan worked on board the ship during this cruise.
Upon the conclusion of the Indian Ocean expedition, Anton Bruun returned to the United States in February 1965. Eight months later, she sailed for the Pacific Ocean to make a series of eight cruises in the Southeastern Pacific Oceanographic Program, conducting biological research in the area of the Humboldt Current and other areas of the southeastern Pacific. Anton Bruun subsequently continued her oceanographic voyages until 1968.
During that year, while laid up for repairs in a floating drydock, the ship suffered extensive damage when the drydock sank unexpectedly. Anton Bruun was slated to be transferred to the Indian government. Restoration, in view of the apparent damage suffered in the drydock mishap, appeared uneconomical.
USS Williamsburg