Just one last attempt to explain Haulbowline basin and drydock. The entrance to the basin is the same width as the entrance to the Drydock at 94ft or 28.48 metres. The drydock is 600 ft long but a ship or ships longer than that were drydocked by putting the Caisson Gate in the basin entrance and pumping out the whole basin plus drydock. We had in effect an expandable drydock facility, the only constraint was the ships could not exceed say 27.5 metres to give some maneuvering room. A ship 30m beam would not fit there or in Cork Drydock up the road.