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When you do that the nap room pods will open revealing a hip Pouch (yay), a Mr Raccoon (yay) and zombie (oh, ffs). When the waves match slot it in to get the power back on. When you have the Signal Modulator you can use it to get the power on in the Nap Room by examining the Signal Modulator and tuning the waves to the signal name written on the electrical outlet on the wall.
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In the second playthrough the Signal Modular will simply be by the soldier's body as you head into the central lift area with the walkways to the east and west sides.
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That will take you through to an area where you can get to the B1 room, retrieve the Signal Modulator and unlock the door back to the Lobby. When you first arrive it'll be locked from the other side so you'll have to play through the mission objectives to get into the greenhouse and open the hatch. The first time through you'll find it in the unnamed B1 room just off the Lobby you reach when you first enter the East area of the Laboratory. The location of the Signal Modulator itself varies depending on whether you're playing a first or second playthrough. The final hip pouch is located in the Nap Room of the Laboratory, but you’ll need to first retrieve the Signal Modulator to turn the power back on.
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