HMS Alliance Cofferdam Work

The NMRN are seeking works to the cofferdam which is beneath the submarine HMS Alliance. The cofferdam requires the removal of the stone ballast (and storage) to access to repair the drainage, as well as removal of the walkway at the bow end of the cofferdam. The walkway will require re-installation as part of the works itself after the drainage of the cofferdam has been repaired and the ballast removed reinstated. This is detailed in the Annex's of this document. The work will be carried out at the Royal Navy Submarine Museum, and the work carried out will often be with the museum itself open to the public. However the NMRN understands that some work will require the closure of the site or the submarine for the work to be carried out.