Full-scale models of her pressure hull were constructed, and used during mid-1942 for underwater tests of experimental shaped charge anti-submarine bombs. In a highly secret British project, "Graph" was also used as a model for the construction of three, full-sized, mock-ups of the control compartment, wardroom and radio room of a Type VII U-boat. These were used to train specialist groups of sailors, who would form boarding parties whenever a damaged U-boat was blown to the surface. They were trained to operate a U-boat's ballast-tank valves, to reverse any scuttling attempts by the crew, and to search quickly for cryptographic equipment and documents.