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Half-Life: Opposing Force Hints
Why can't I get into the Specimen Containment Room?
1 of 5: The door is controlled by the computer system nearby.
2 of 5: But wait; wouldn't you rather listen to the pending message that the computer has?
3 of 5: Use the red button to start up the message.
4 of 5: Once the message is complete, the computer will open the door for you.
5 of 5: Be sure to get the barnacle weapon that's in one of the glass containers. It'll be essential in several areas throughout the rest of the game.
