HMS Goliath was sunk on the night of May 13 1915 with a major loss of life including many men from Waterford and Wexford. This blog gives an overview and records the names I have found online. 

She was a Canopus-class pre-dreadnought battleship laid down in January 1897 and commissioned in March 1900. Built at Chatham Dockyard, she featured a shallow draught designed specifically for transit through the Suez Canal to serve in East Asia, and she carried a primary armament of four 12-inch guns. She served in a number of capacities up to the start of WWI 

WWI

At the outbreak of the First World War in August 1914, Goliath was mobilised into the 8th Battle Squadron. She initially served as a guard ship in Loch Ewe, one of the harbours used by the Grand Fleet, before escorting the crossing of British troops to Belgium in late August. Goliath then took part in operations against German East Africa, participating in the blockade of the German light cruiser SMS Königsberg in the Rufiji River. From March 1915, she was part of the Dardanelles Campaign, and remained in support of the landings at Gallipoli in April.

Accessed from https://commons.wikimedia.org/wiki/File:HMS_Goliath_during_the_First_World_War_IWM_Q21299

Gallipoli

By the middle of May 1915, the Allied fleet had established a regular rotation off Gallipoli, keeping two battleships on station each night to provide gunfire support for the troops on the peninsula. On the night of 12–13 May, the Goliath was stationed in Morto Bay alongside the battleship HMS Cornwallis. Goliath was positioned ahead of Cornwallis, and five British destroyers patrolled the immediate area to protect the capital ships from Ottoman torpedo craft. 

Taking advantage of a moonless night, the Ottoman destroyer Muâvenet-i Millîye set out on 12 May. By maintaining a very slow speed to minimise noise and wake, the vessel successfully bypassed the patrolling British destroyers, entering Morto Bay around 1 am on 13 May. 

At 01:15, lookouts aboard Goliath spotted the approaching vessel and issued a standard challenge. The crew of the Muâvenet-i Millîye replied to the challenge which fatefully delayed British reaction, then quickly accelerated and launched three torpedoes. Though Goliath’s crew opened fire, they were only able to discharge three rounds before the first torpedo struck. 

Ending

The first two torpedoes hit almost simultaneously, one abreast of the forward turret and the other abeam the forward funnel, causing a major explosion. Goliath began to capsize immediately. As the ship lay on her side, the third torpedo struck near her after turret. 

The Muâvenet-i Millîye retreated at high speed and escaped undamaged in the darkness. Nearby British warships immediately moved to the location to conduct rescue operations. Of the 750 crew members aboard Goliath, 570 were killed in the sinking, including the ship’s commander, Captain Thomas Shelford.

How many died?

Out of her crew of 750, 570 were killed in the sinking.

The following names were from Waterford or were born in the county:

• Michael Allen, Tramore
• Michael Cunningham, Clashmore
• James Flynn, Carbally
• Michael Flynn, Corbally
• Michael Gyles, Tramore
• Thomas Keohane, Tramore
• James Mason, Passage East
• Michael Power, Tallow
• William Power, Tramore
• James Walsh, Passage East
• George Waters, Tramore – fleet surgeon.
  
  A number of Wexford men were aboard too. Including men originally from Fethard, Ballyhack and New Ross

• Michael Joseph Allen, New Ross
• William Barron, Ballyhack
• William Dempsey, Wexford Town
• Patrick Kavanagh, Gorey
• Michael Myler
• Patrick Murphy, Lewistown, Fethard

Much of this information came from wikipedia, the local crew details I found elsewhere. If you have any further biographical details on any of those listed or have other Irish born crew I could include please drop a comment.