 Fearless rejoined Marlborough around 04 : 00 and both ships briefly fired at the German <unk> <unk> . Commodore Reginald <unk> 's Harwich Force had been ordered to reinforce the Grand Fleet , particularly to relieve ships low on fuel ; they departed at 03 : 50 but this was too late for them to reach the fleet by morning , so Jellicoe ordered <unk> to detach destroyers to escort Marlborough back to port . On the way , Marlborough and Fearless encountered the British submarines <unk> and <unk> ; the two submarines prepared to attack the ships but <unk> recognised them before they launched torpedoes . By 15 : 00 , eight destroyers from the Harwich Force had joined Marlborough and another pump had been lowered into the flooded boiler room . At around 23 : 30 , the pump was being moved to clean it when the roll of the ship threw the pump into the damaged bulkhead , knocking the shores loose . Water flooded into the ship and Marlborough 's captain ordered Fearless and the destroyers to prepare to come alongside , to rescue the crew if the flooding worsened at 00 : 47 on 2 June . A diver was sent into the boiler room at that time , and he was able to keep the pump clean , which slowly reduced the water level in the ship . 
