A close view of part of the starboard forward poppet of the Royal Navy battleship Thunderer (1911) on the building berth at the Thames Iron Works shipyard at Blackwall, London. The photographer is looking down and slightly forward at the aft dogshore, which has "Success to the Thunderer" painted on it. Shipwrights are standing at each end of the dogshore and two of their hammers are laying on the wooden staging.