File contains request from Intelligence Officer Irish Command for enquiries to be made as to whether any persons have been observed prospecting for minerals on the islands off the Cork and Kerry Coast. Further includes request from Royal Irish Constabulary, relative to the alleged supply of petrol etc. to enemy submarines, for names of pensioners and others who have been in Irish Lights Service and now reside in or around Wexford. The list of names is provided. The file is marked 'Confidential'.

Files contain letters and telegrams from F. Coupe, Principal Keeper Skelligs. Included are details of: Norwegian barque 'Superb' torpedoed (June 1915) ; rescue of two boat loads of survivors from Wreck of SS 'Marina' by signalling to passing ship with flags, fog gun and lights (October 1916) ; reward for rescue of crew of SS 'Marina' from Donaldson Bros Ltd. and Board of Trade ; shipwrecked crew of Norwegian Ship sunk by submarine landed on Rock and assisted by Keepers (August 1918).

File contains letters and telegrams from T. P. Murphy, Principal Keeper Fastnet. Included are details of: instructions from Admiralty to inform all British Ships that War has broken out (6 August 1914) ; instructions from Admiralty to inform all vessels proceeding to Queenstown (Cobh) to ask Old Head for the Swept Channel ; reporting Transports to War Signal Station Brow Head ; sighting of a possible submarine (May 1915) ; confidential Lloyd's Weekly Booklet to kept in Principal Keepers custody and destroyed by fire when next issue received.

File contains letters from W. Wafer, Master of Daunts Rock Lightship; and Admiralty, with details of: information re the moorings of the lightship ; proposal to establish telephonic communication between the Lightship and the mainland not proceeded with ; orders to discontinue submarine bells ; submarine sightings ; crews from ship brought aboard following sinking by submarine attack (23 April 1917).

File contains letters from T. King, Principal Keeper Rockabill, with details of: sightings of submarines ; compensation for clothing and provisions given to shipwrecked crew of SS 'Salamania' who landed on Rock on 30 March 1918 ; compensation for clothing and provisions given to shipwrecked crew of SS 'Poliwell' who landed on Rock on 5 June 1918.

File contains letters from P. J. Carolin, Principal Keeper Dunree, and Lough Swilly Garrison, with details of: flagstaff used by Garrison ; submarine sightings ; extinguishing Light.

File contains confidential Admiralty Memoranda re: 'Instructions regarding Hostile Submarines' ; 'Submarines in Home Waters' ; 'Instructions regarding Use of Rifles and Machine Guns by Merchant Vessels for Defence against Aircraft and Submarines' ; 'A Suggestion for rendering ships of the Mercantile Marine immune from the effects of torpedo attack' ; profiles of British and German Submarines ; list of Irish Lights Stations electrically connected with Telegraph Service.

File contains letters from J. H. Lavelle, Principal Keeper Bull Rock; D. O'Donnell and James A. O'Connor, Assistant Keepers. Included are details of: sightings of submarines ; sighting of suspicious lights.

Files contain letters from J. J. Duff and [H?] Higginbotham, Masters of South Rock Lightship; and Admiralty with details of: submarine sightings ; rewards for submarine sightings ; sightings of suspicious vessels ; sighting of submarine attack, sinking 5 steamships (2 May 1917) ; sighting HMS Destroyer taking enemy submarine to Belfast (8 July 1917).

Files contain documents re Signalling and Reporting at Tuskar Rock Lighthouse including: instructions received by J. Glanville, Principal Keeper Tuskar Rock Lighthouse, from Admiralty re communicating signals to War Signal Station ; Naval Signalmen accommodated at Tuskar Rock for purposes of communicating orders to the Auxiliary Patrol Vessels (January 1916-November 1917) ; request for an award for P. J. McGinley, Assistant Keeper, for providing information re submarine spotted off Tuskar (April 1917).

File contains letters from R. J. Duffy and J. Ryan, Principal Keepers Galley Head. Included are details of: reporting to Coastguard re lifeboats from torpedoed vessel SS 'Arabic' (August 1915) ; reports of dead bodies of two women washed ashore from 'Arabic' disaster (October 1915) ; report of cargo steamer sunk (September 1916) ; reports of Danger Signals flown by boats in distress (October 1917 and March 1918).

File contains letters and telegrams from J. J. Sweeney, James O'Connor, and A. J. Hamilton, Assistant Keepers Mizen Head, and T. P. Murphy, Principal Keeper. Included are details of: instructions from Admiralty re reporting submarines or suspicious vessels ; reports of submarine sightings ; rewards for reporting submarines ; instructions to screen all Lights at the Station.