I'm not familiar with the details of tgia project, but i know that for other submerged tunnels they pump grout (kind of liquid cement) under the segments, so bo

I'm not familiar with the details of tgia project, but i know that for other submerged tunnels they pump grout (kind of liquid cement) under the segments, so both segments on a joint rest on the same chunk of grout. There are probably pipes embedded in the tunnel segments during construction xfor this purpose