Lower Gun Floor through the gun port doors you will see the Great Barrier Ditch which used to run all the way down to the River Medway. The 2 arched brick bridges spanning the ditch were built around 1890 to replace the earlier drawbridges.

The pit below the gun ports prevented an enemy climbing in through the gun ports.

The single fireplace provided some comfort for the gunners based here and allowed them to heat the shot to fire at ship's rigging if attacked from the river.