Senior Structural Engineer Steve Mettam sent us some  photographs taken of the bastion tower ruins during their pre-demolition surveys in early 2014.

The subterranean ‘low chamber’ is not currently accessible, except via use of harness and winch, by experienced confined spaces trained personnel only. The castle ruins cannot be seen from the new raised ‘lockable’ double triangular surface cover. The square chamber approximately 4m x 4m x 4m deep is experiencing  some groundwater infiltration. We pumped it out once and used infrared heaters to dry it out,  but since the demolition finished at the end of February, it has filled up again now to a depth of 0.5m.

We are trying to determine where the water is coming into the chamber, there is a redundant 300mm dia. service pipe running through it, which we have now CCTV surveyed. I suspect the construction joint between the floor slab and the chamber walls has no waterbar incorporated within it, but the water could also be entering via the surround to the pipe or castle ruins. A survey crew is going to enter the chamber shortly, once we have de-watered it again, to record the chamber’s condition and to try to identify where the groundwater is entering it and we shall make an attempt to ‘stem’ this flow.

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External Information

Here are some links to information about the castle available on other sites. Gatehouse page Manor Lodge’s page Prospectus for Sheffield Castle Sheffield City Council’s

Bishops Hous

Plasterwork in Bishops House

This plaster overmantle is on the wall of the bedroom in Bishops House. The room was built around 1650 and in 1648, William Blythe paid

Archaeological Investigations

Here is some information about previous excavations. You can also download pdf documents produced by ARCUS on two pieces of fieldwork. Trial trenching of Sheffield

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