In Metal Gear Solid, which boss battle takes place in a freezer?

In the original Metal Gear Solid, the freezer boss battle is against Vulcan Raven.

Solid Snake fights Vulcan Raven in a large cold-storage area during the Shadow Moses operation. Raven is a member of FOXHOUND and uses a powerful M61 Vulcan cannon mounted on a tank during an earlier encounter. The later freezer confrontation is fought on foot.

The icy setting is important to the battle because the floor affects movement and the environment helps shape the encounter’s visual identity. Raven is a physically imposing shaman and warrior who views Snake as a fellow battlefield figure.

The freezer battle is often confused with Sniper Wolf’s snowy encounters, but those take place outdoors on the island. Psycho Mantis is fought in a different indoor room, where the battle instead emphasizes his supposed psychic abilities.