The two groups arrived at the entrance to a ziggurat which they believed had been used by the Goa'uld masquerading as the Babylonian god Marduk. As soon as they entered the ziggurat, however, everything went wrong. Zukhov set off a booby trap when he found Marduk's sarcophagus which locked the entrance to the ziggurat, the entrance crushing Lt. Marchenko in the process. Soon after this Lt. Tolinev, another of Vallatin's team, was attacked by a strange creature which was housing Marduk's symbiote, poisoning her and sending her into shock.