File contains letter from W. Glanville, Principal Keeper Kilcredaun, reporting Patrol Boats mine sweeping in vicinity of Station (June 1917).

File contains letters from N. Murphy and James Rossiter, Masters of South Arklow Lightship; and E. Kearon, Mate, with details of: sightings of submarines and floating mines ; explosions heard.

File contains letters from H. Crowley and R. H. James, Principal Keepers Fanad Point, with details of: German mines come ashore (January 1915) ; extinguishing Light ; sightings of mines; Torpedo Boat Destroyer 'Magic' damaged by mine.

File contains letters and telegrams from John Henry Murphy, Principal Keeper Clare Island, reporting: observing life raft adrift (May 1916) ; mine ashore (November 1917) ; reduction in power of Light (March-November 1918).

Files contain letters and telegrams from P. J. O'Donnell and R. Duffy, Assistant Keepers Inishtearaght; and J. Cooper and F. Curling, Principal Keepers. Included are details of: sightings of submarines and floating mine ; Oil Tank Steamer in Distress (January 1917) ; assistance to crew of SS 'Scalpa' who landed on Skellig (April 1917) ; Leith Hull & Hamburg Steam Packet Co. payment for provisions supplied to crew of SS 'Scalpa' and reward for Keepers ; reducing power of Light (March 1918).

File contains list of Crew and Officers on SS 'Alexandra' granted Admiralty Award for sinking mine in Sligo Bay on 15 December 1917. Includes report from R. C. Hill, Commander, re receipt of cheques.

File contains request from Admiralty to supply 22 Conical Buoys (one a Gas Buoy) for marking the proposed Swept Channel to Lough Swilly, and 8 unlit Conical Buoys for a similar purpose at Berehaven, Bantry Bay. Included is a list of Irish Lights Buoys available for use by the Admiralty.

File contains letters from J. O'Brien, Principal Keeper Roancarrigmore, and M. J. Healy, Assistant Keeper. Included are details of: instructions from Admiralty to extinguish Light at Roancarrigmore when ordered by Senior Naval Officer at Berehaven ; report of floating Mine (July 1917) ; list of dates Light was exhibited in November 1917, February, March and September 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 reports from Michael Polly, Principal Keeper Dunmore East, and J. Connolly, Assistant Keeper, of sighting several ships sunk in the area having been torpedoed or struck mines. Also included are details or crews being landed in Dunmore East.

File contains reports from W. Eager, Principal Keeper Hook Tower, of sighting several Patrol Boats sunk in the area having struck mines. Also included are details of a large Barque torpedoed and sunk on 29 April 1917.

File contains reports from Henry Thomas Murphy, Principal Keeper Mine Head, and Henry Hammond, Principal Keeper, of submarine sightings and attacks on ships in the area.