103. Hissing noise of compressed air in the control-room, any time high-pressure air is being released, no matter the compartment from which the valve is opened. This would help dive-officers realise that there's an open valve somewhere, especially the diesel start valves, which are often missed due to the general noise level, as well as prompting him to reverify all his own valves are closed as appropriate. The noise should possibly be a relatively low frequency version of the usual "hiss" when an air-valve is opened. The reason for creating this noise in the control room, is that that is where a good number of the high-pressure air-cylinders are located.
Consideration could be given to the adding of the port electric compressor, and give this the ability to gain compressed-air even whilst submerged, providing no crew remain in that compartment, and intervening doors are closed. Entering an airless compartment would be possible for very short period of a minute or so, allowing: Compressed air available to blow the bilge, and a partial MBT blow to get the u-boat's hull-valves above the waterline, to in turn open the hull valves (equalising the pressure in compartments) and starting the diesel-powered compressor in the usual fashion. Once this was done, it'd be possible to complete the MBT blow, and get to the surface?
Primarily we need some means other than continuous and unremitting watching of the compressed-air gauge, to tell players that there's a discharge of high pressure air on the boat at that time?
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