You want to wait 'til the patrol leaves, and then move down the passage and a little to the right. At this point, wait for the patrol to come back, and when they go past you up the passage you just came from, head off down the ramp and through the doorway on your left. This saves you having to hide from the patrol in the tunnel, which is possible but riskier.
Once into the passage, follow it through and you come out in a large chamber. At this point, turn sharp right and move away from the door so the patrol don't spot you when they come back.
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