And looking at tunneling technology, it turns out that in order to make a tunnel, you have to -- In order to seal against the water table, you've got to typically design a tunnel wall to be good to about five or six atmospheres.
Apskatot tuneļu tehnoloģiju, izrādās, tuneļa izveidei vajadzīgs... Lai nodrošinātu tuneli pret gruntsūdeņu iedarbību, tuneļa sienai parasti jāiztur piecas vai sešas atmosfēras.