Why does Zak die when he gets to Mars

Hint 1 of 13:

If the life support system is off, he'll die immediately.

Hint 2 of 13:

Otherwise, he won't die until he leaves the face.

Hint 3 of 13:

Unless, that is, he is properly protected.

Hint 4 of 13:

Read the sign in the hostel.

Hint 5 of 13:

He needs a space suit.

Hint 6 of 13:

A wet suit will do.

Hint 7 of 13:

And a helmet to go outside.

Hint 8 of 13:

Sushi lives in a kind of helmet.

Hint 9 of 13:

Dump Sushi in a plant or the sink in SFO and put on the fish bowl.

Hint 10 of 13:

You need to also wear the oxygen tank from the plane.

Hint 11 of 13:

(Read part 2 below if you don't have the tank.)