1.   A tunnel links the laboratory and crew cabin.

2.   All the wells in each network are linked by tunnels large enough for young, strong bodies periodically to clear of mud so the water can continue to flow.

3.   The tunnels would link the Capitol with four state office buildings.

4.   The tunnel links the islands of Falster and Lolland.

5.   The tunnel links the Western Wall with the Via Dolorosa, where Jesus was said to have walked before his crucifixion.