Hi,
The tunnel system you refer to is under St Saviour's church in Guernsey - I'll find some diagrams & post.
In Jersey, quite a complex tunnel system was underway during the 5 years of occupation with at least 15 listed around the Island:
Ho1 St Peters Valley â?? munitions store â?? under construction but in use
Ho2 St Peters Valley â?? ration store â?? under construction.
Ho3 Bellozanne Valley â?? munitions store â?? planning stage only.
Ho4 Grand Vaux munitions store â?? under construction but in use.
Ho5 St Aubin â?? Fuel store but used to store munitions.
H06 St Peters Valley (Le Pissot) personnel shelter â?? completed but sealed and obliterated in 45/46.
Ho7 St. Peters Valley (Cap Verd) â?? Artillery reserves â?? exploratory work only (rear entrance to Ho8 is also here).
Ho8 St Peters Valley Artillery Quarters â?? under construction but in use.
Ho9 Bellozanne Valley electricity works 1 â?? planning stage only.
H10 Grand Vaux ration store 2 â?? under construction.
H11 Grands Vaux personnel shelter- believed completed but sealed and obliterated in 45/46.
H12 Grands Vaux fuel store 2 â?? exploratory work only.
H13 Beaumont Valley munition store 4 â?? under construction.
H14 Mont au Roux fuel store 3 â?? exploratory work only.
H15 Beaumont Valley â?? purpose unknown â?? under construction.
H 16 / 17 / 18 Nothing known as to location or purpose or if completed !
Ho19 St. Helier harbour (La Folie) â?? electricity works â?? under construction and used to store munitions.
A number were used to dispose of hand & artillery weapons, equipment, lorries even, the remnants of one such forgotten lorry may be viewed on the following mini film. The size of these tunnel systems can be quite considerable.
Enjoy,
http://www.youtube.com/watch?v=xNeuijh10bE
http://www.occupied.guernsey.net/fortifications.htm
Brendan