E750 is the code name given to an unknown species of animal cloned by Dr. Henry Wu. This animal was contained in a secret laboratory within the Maintenance Tunnels on Isla Nublar. E750 was kept frozen in cryogenic containment, unconscious, but alive for unknown reasons. The laboratory’s power was routed through a secret primary control room in the Maintenance tunnels.
When Kenji initially presses a green button in the control room, it shorts out the power to the containment unit. However it would not be until Compys begin to move into the tunnels, biting through power cables, that the door to the laboratory itself would become unlocked. This would trigger an alert, as the animal audibly growled, signifying it was thawed, and aware.