Um, there is no scientific way that creature could have borrowed under the ground. Its diameter was at least 17 feet wide and its length 26 -- likely with a mass of 21.6 tons (metric, of course). For a creature of that mass and width to effectively tunnel through the earth it would require z^2-5z-y^2+3z+y+25z+3y kilonewtons of force to at that speed,(Where x is equal to the tensile strength of the packed earth they stood on and y is equal to the number of hot pockets I ate today). According to my calculations, such a maneuver could only be performed in a subquantum singularity.
This show is so unrealistic.