Detonator Switch
From WikiRaider
Remark: This article describes the Detonator Switch in Tomb Raider III. For information about the key found in Tomb Raider II, see Detonator Key.
Lara must find the Detonator Switch (which is hidden into the elevator shaft) to blow up a rocky wall in the Nevada Desert. After that, she gets access to go further and then to prison area.