Lloyd's building consists of three main towers and three service towers around a central, rectangular space. Its core is the large Underwriting Room on the ground floor, which houses the Lutine Bell within the Rostrum. Also on the first floor is loss book which for 300 years has had entries of significant losses entered by quill. The Underwriting Room (often simply called "the Room") is overlooked by galleries, forming a high atrium lit naturally through a huge barrel-vaulted glass roof. The first four galleries open onto the atrium space, and are connected by escalators through the middle of the structure. The higher
HMS A4 in contact with the battery acid. The crew managed to blow the ballast tanks to surface the boat and evacuate onto the deck, but there was an explosion whilst she was being towed back to port and she slowly sank. The boat was salvaged and repaired. The captain of the submarine at the time, Lieutenant Martin Nasmith, was later awarded the Victoria Cross for his command of during the Dardanelles campaign in 1915. During the First World War she was used for training at Portsmouth, and was sold for scrap on 16 January 1920. HMS A4 HMS "A4" was an