Construction of this initial emplacement took about three years and was completed in 1874. The sandstone pit once had a steel dome (to protect from shells) and was part of a series of gun emplacements protecting from the threat of invasion. Today, you will find a series of tall sandstone channels and the circular pit where the main gun once stood. A set of un-railed steps leads into the pit - please take care in the area, as the pit is not fenced.