USCGC Argo (WPC-100) was a Thetis-class patrol boat belonging to the United States Coast Guard launched on 12 November 1932 and commissioned on 6 January 1933.

Investigating the location where the charges were released, her crew observed a large area of bubbles and an oil slick leading to the horizon, presumably in the vicinity but beyond where the attack was made.

[1] While Argo was in convoy on 6 January 1944, the merchant tanker Camas Meadows and the Navy gunboat USS St. Augustine collided.

In 1947 the commander of First Coast Guard District requested to place Argo in "out of commission, in reserve" status due to manpower shortages.

The establishment of the Weather Patrol Program strained Coast Guard manpower and the Argo was placed in reserve status.

She was eventually acquired by Circle Line Sightseeing Cruises of New York City and greatly modified for passenger service.