You will need to be in control of Caleb Pearson.
Once you leave Block F-3 into the final area, the Cryonics lab is immediately on your left. There is a keypad that prevents access, I believe the code is 2796.
Once inside, ahead and slightly to the right is a desk with a recording. Listen to this. Then check the cannister next to it. Now go into the next room and check the left Cryo unit for the poor fellow in there.
Now finally, go to the computer. The clue is -457.96 farenheit for the password. This took me a while to figure out, but this temperature is known as absolute zero. So that's the password, 0000. Check the emails and once you're done the achievement will unlock.