OK several have had a problem here, including me. In fact the floor slides open and you fall down into the Nagra`s ante chamber. If I remember rightly it turn into an elevator when you exit the snake pit. Save before pressing the button. Stand in the middle of the floor and press the button. Now some have looked down and fell in no problem I however kept ending up in a shaft with a passage that I could not go down (in fact this is an exit/entrance in the shaft). I found that pressing the button and then holding down the jump key ( 0 unless you have remapped it) worked for me.
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