Some possible alternative means of access are listed under
paragraph 3.9 of the Technical provisions for means of access for
inspections (TP). Always subject to acceptance as equivalent by the
Administration, alternative means such as an unmanned robot arm, ROVs
and dirigibles with necessary equipment of the permanent means of
access for overall and close-up inspections and thickness measurements
of the deck head structure such as deck transverses and deck longitudinals
of cargo oil tanks and ballast tanks, should be capable of: