In Stalker 2: Heart of Chornobyl, players can embark on the "For Science!" side quest, a mission leading to access to the STC Malachite facility. This guide details how to initiate and complete this quest.

Initiating "For Science!":

The quest begins by interacting with Yaryk Mongoose in the Central Elevator area of the Chemical Plant. Upon approaching, Mongoose will contact Skif via radio, prompting a meeting. Locate Mongoose on the first floor (easily accessed by vaulting a railing). He'll explain the need to activate a second measuring device atop a silo, initiating the quest.

Reaching the Silo's Summit:

Ascend the building's stairs, eliminating any rodent encounters. Exit through a broken window, descend a ladder, and traverse the walkway to the silos. Beware of electro anomalies; equip appropriate gear. Proceed left along the silo's top to activate the device. This will attract Bloodsuckers. Choose to fight or evade them.

Confronting Yaryk Mongoose:

Return to Mongoose; he'll explain the experiment's unintended consequences. Players can choose to kill Mongoose or accept the reward peacefully. Both options yield the Malachite pass, granting access to the STC Malachite. The peaceful approach also provides additional in-game currency. The Malachite pass is useful even if you've already gained access through main missions.