Warship 1973 S01E01 Hot Pursuit

HMS Hero is undergoing a self-maintenance period in Gibraltar after several months without a captain or first lieutenant. After the arrival of Lieutenant Commander Beaumont and Commander Nialls, a random incident with a crew member in a bar leads to a civilian ship suspected of gun running. When the ship leaves port with its cargo, HMS Hero takes pursuit and forces the ship to stop in international waters, where the doctrine of hot pursuit is explained to its crew.