SS Petersburg - Shaft Alley

Originally built in 1963, the Petersburg was one in a fleet of five tankers fitted with an offshore petroleum discharge system.

An Offshore Petroleum Distribution System (OPDS) provides a semipermanent, all-weather facility for bulk transfer of petroleum, oils, and lubricants (POL) directly from an offshore tanker to a beach termination unit (BTU) located immediately inland from the high-water mark.