STAR TREK 2 Set Photo of Spock Wearing a Volcano Suit

Here's a photo from the set of Star Trek 2 featuring Zachary Quinto as Spock in an interesting looking suit dangling from some wires in front of a green screen. I've got to say, that Quinto looks incredibly uncomfortable wearing this suit that looks like it was built by Tony Stark. The suit is called a Volcano Suit and can obviously withstand insanely hot temperatures. Here's a note that came along with the photo. 

After first rehearsing the scene with Spock's stunt double actor, Zachary Quinto was then rigged to a wire in front of a large green screen and lifted to a height of 10 stories high then dropped at a high rate of speed as if he was falling. In the scene Spock is wearing a 'Volcano Suit' and carrying an unknown piece of equipment with the Starfleet emblem. A volcano is somehow involved in this scene. The crew had a real fire burning off camera to catch the fire reflections on Spock's 'Volcano Suit'.

Well, whatever Spock is doing dropping into some kind of intergalactic volcano, lets hope if works. Do any of you have any ideas on what Spock is trying to do here?