122. Jurisdiction in internal waters.

The territorial state has jurisdiction over foreign merchant vessels1 in its internal waters and over crimes committed on board such vessels. It may arrest persons on board foreign ships in internal waters2. In practice, jurisdiction is not exercised unless the consequences of the crime extend to the territorial state or the crime is serious or the assistance of the local authorities is sought by the master of the ship or by the flag state3. United Kingdom courts may by Order in Council be barred from entertaining without the consent of the flag state proceedings in respect of crimes on