Diggers in Space

A portal was found deep underground, from where the aliens began to appear. The aliens decided to take over the Earth and enslave the earthlings. Then a team of professional diggers was assembled, who were assigned the mission to bury a hostile portal on the nearest planet. The main task is to bury the portal below the 10th layer. Erect turrets to defend against alien attacks. Then go to the laboratory to examine the remains and spend them on improving the turrets.