The Sigonyth website has been updated with some new info about the project, more specificly they've posted about one of the species of critters. Here's some info:<blockquote>(...) several hundred meters below ground, in the dark and cold corridors and passages dwells one of the most dangerous creatures on the planet - especially dangerous to miners armed only with drills and pickaxes - commonly dubbed the Rock Mole. Being not what you would consider garden vermin, these gargantuan beasts can strike blows more forceful than an armoured vehicle. In spite of their sightlessness and incommodious movement the moles strike terror into anyone who hears the sound of their paws cleaving the granite rocks. </blockquote>You can also view this critter in this and this animation.
Link: Sigonyth
Spotted at VDHP.
Link: Sigonyth
Spotted at VDHP.