(spoiler) Can't find eye

[Janakev]

The hand eh? Well, first off, have you gotten by the gas leak leading to the machine room? If not:

Spoiler below!

You need to go to the storage room. There is a dead man with a gas mask there that you can use.

Now as for the hand itself:

Spoiler below!

It is within the machine room complex. If you get stuck within that let me know. I think it would be more satisfying to see if you can get by on your own.