On the Costa Rican Plantation, you will see a Female Slave being beaten by a guard. Kill him, and she will ask you to save her friend, do so, and you will get the Labs after completing the Level.

Gameplay still remained great. The falcon (i believe it's called) gun was cool. Improved cutscene graphics. Storyline wasn't that good though. I believe this came out at the end of the ps1's life ...