How to dig tunnels with the blades? (Battlefield Vietnam)

Skopipastil from the site of the airbase
Playing for North Vietnam, on some maps probably noticed time and again on the earth Luke hanging around with a shovel.. so here is the mobile respawn point (where you appear). These points can be transferred to any place on the map. For this you need to choose a technique with a spade (SHOVEL), to come to this point and press G - you picked up the point.. now to dig it elsewhere, select the shovel and click the left mouse button(you can dig only on the ground). If you got killed when you transferred the point, it will shortly reappear at its original location.

BioGen
Thank you, now everything is clear.