sentences:  The ingenious three-section hydraulic boom design of these vehicles means that the rescue cage can be positioned below ground level, and can therefore be utilised in water rescues, or rescues off a bridge parapet or into a shallow ravine.The fireboat "Vigiles" is located in Plymouth and is used to protect the Royal Naval Dockyard, the oil storage facilities and the commercial shipping that uses the port.Its high speed also enables it to carry out a rescue role if required.