You have to get a balloon.
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Stay on the bottom level until you get to the left side, and the jump up on the boxes behind a guard. Then, if you time it right, you can jump to the third level, sneak past the guard, and onto a very bouncy couch. Then you use the Black Widow Card Key, to get into the locked door!
Duck past the Security Room when you don't see the shadow on the window blinds. Then hide behind the statues to avoid the lasers as you make your way to the exit at the right side.
To get past the Black Widow's guards in her lair : Go along the bottom level until you get to the end. Climb up behind the guard and get above him on the boxes. When you see the female guard (third level) walk over and turn away, jump up and sneak behind her until you get near the chair. Jumping on the springy chair should send you up and left to the locked door. (You have the key card.)
You must go on the Underground Tour before you can apply for the job at the museum.
First you have to run all the way to the left. Then jump up to wear the guard is he cant see you because your on he other side.:D And keep going youll make it but make sure you have your spider card :D