Red Pass Card (Diving Area)
From WikiRaider
Red Pass Card is an electronic key found in the level Diving Area in Tomb Raider II.
The Red Pass Card is seen being hacked away by a Spinning Saw, and a Machine Chip must be inserted into an electrical panel near it in order to turn it off. The Machine Chip is dropped by a guard in the central chamber, the same area in which the Red Pass Card Slot is. Once inserted, the door opens, and Lara now has access to the actual Diving Area.