If the pressure drops, the soil pressure increases and this leads to subsidence at the ground level. Since exploitation of the Slochteren (Netherlands) gas field started in the late 1960s the ground level over a 250 kmÂ² area has dropped by a current maximum of 30 cm.
Confidence votes 18.5K. There are quite a few tools that the Astronauts use, though for construction and maintenance in space, the Pistol Grip Tool (PGT) is the primary tool of choice. Its predecessor was the Power Ratchet Tool (PRT), originally developed and created for servicing the Hubble Space Telescope.
Astronauts upgraded the telescope with the Wide Field Camera 3 and the Cosmic Origins Spectrograph, and repaired the Advanced Camera for Surveys and the Space Telescope Imaging Spectrograph. They replaced Hubble's batteries with new versions, and a Fine Guidance Sensor with a refurbished one; installed six new gyroscopes; and added new insulating panels to areas where Hubble's blankets had broken down.