Jump To The Earths Core

When skydivers are forced to jump into a crater caused by Aliens to deliver a bomb Jake insists that his dog goes along. Complications arise when his dog is injured and they need help. To their amazement they find other life forms inside this earth that have ideas of their own. The inner world is filled with life and nature on there own and with their own ways of survival. Giant spiders and prehistoric beings from before the ice age and flood are ready to devour all that enters. How will this team survive with an injured dog and how will they return to their world they were forced from?