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 Lutine (1779) cavity excavated by the machine. Unfortunately, the wreck remained heavily silted up, with the depth of water varying between a high of (in 1873) to a low of (in 1868 and again in 1884). However, ter Meulen was responsible for re-establishing the landmarks used for taking transits of the wreck site and for establishing its position: . In 1886 a cannon was salvaged and presented by Lloyd's to Queen Victoria: it is now on display at Windsor Castle. Another was offered to the City of London Corporation and is on display at the Guildhall, London. A final cannon was passed