On the "Dark" (far) side of the Moon, on Sept 9th 1999, a radiation check is going to be run at Nuclear Waste Disposal Area Two.
Jim Nordstrom and Steiner, approach a laser barrier and temporarily turn one segment off to enter the area.
They are being overseen by Professor Bergman and Doctor Russell, who are in the Monitoring Depot.
In the meantime, Eagle 14 is unloading more canisters nearby.
Nordstrom or Steiner is using a hand-held Geiger Counter, which finds no sign of extra radiation.
Nordstrom goes mad, attacking Steiner and trying to escape Area Two, running into the laser barrier and damaging his helmet against a rock. He dies (implied by the scene but verified later).