The cable office at Porthcurno was a critical communications centre .
The cable office at Porthcurno considered at serious risk of attack during the Second World War being only about 100 miles ( 160 km ) from the port of Brest in occupied France .
The cable office at Porthcurno was a critical communications centre and considered at serious risk of attack during the Second World War being only about 100 miles ( 160 km ) from the port of Brest in occupied France .