Mantolith

The Mantolith was a large assault drill used to deliver troops in subterranean assaults during the Great Crusade and Horus Heresy. These vehicles were large enough to allow for teleportation chambers, allowing them to deliver troops to its target without breaching the surface. Several Mantolith's were used by the Sons of Horus during the assault on the Saturnine Gate in the Siege of Terra.^[1]