Gas turbine engine

A gas turbine engine having:

• a fire wall that is configured to provide a fire resistant barrier between a first zone and a second zone in the gas turbine engine, the second zone being hotter than the first zone when the gas turbine engine is in use;
• an actuator that is located in the first zone and is configured to generate a mechanical force when operated;
• an actuatable device that is located in the second zone and is configured to be actuated by a mechanical force;
• a mechanical force transmitting device that extends from the actuator to the actuatable device via a hole in the fire wall, wherein:
• the mechanical force transmitting device is configured to, when the actuator is operated, actuate the actuatable device by transmitting a mechanical force generated by the actuator to the actuatable device;
• the mechanical force transmitting device includes an elongate element configured to move along a linear path so as to transmit a mechanical force generated by the actuator to the actuatable device, and an elongate housing/shell, the elongate element being configured to move along a linear path within the elongate housing/shell;
• and
• the gas turbine engine includes an off-take device for extracting cooling air from an airflow in the gas turbine engine and for supplying the extracted cooling air to be guided into the elongate housing/shell when the gas turbine engine is in use.