PRIME_BBCODE_SPOILER_SHOW PRIME_BBCODE_SPOILER: There's no indication that a timer puzzle begins when...
you deploy the Penguin, which will soon get you killed. This looks similar to the walking death animation. Without a narrator cue or something, players who see the ladder won't recognize they still have a functioning HAND to grab it.
"You climb up the manhole cover and close it behind you, as to not draw any attention to your do-abouts."
Since 'do-abouts' isn't a word, 'infiltration', 'tresspass' or 'antics' might work better.