The Ultra Freeze was built in 1959 by J.J Sietas Schiffswerft in Hamburg. She was owned by Trans Caribbean Lines and managed by Trans Caribbean Agencies Inc. of Miami. She was 207 feet long, had a 30 foot beam, and displaced 852 gross tons. The Ultra Freeze was originally built as the Herbert Horn, but she was renamed Mary B in 1968 and Ultra Freeze in 1970.

While on the Miami River she was abandoned, vandalized and slowly stripped until she was worthless. Lloyd's of London reports that she was scuttled on July 5, 1984. The steel hulled Ultra Freeze now rests in the Miami area in 118 to 131 feet of water and rises to within 70 feet of the surface. The wreck sits on a slope with her stern facing west. Mike Lawrence reports that she sits intact and upright and that her stern has an amazing amount of marine growth. The wreck's propeller is always a good photo background.

Photo: The Ultra Freeze was 207 feet long, had a 30 foot beam, and displaced 852 gross tons. Photo by Robert Holland.