For a terrifying moment I think that I have given the game away. The couple are there again and I sneeze, loudly. They stop their physical flirting and stand totally motionless. They look at each other, bursting to laugh.

The man trots silently over to my door, with his finger pressed against his lips. The girl starts to laugh and he looks back at her motioning downwards with his hand to keep her quiet.

He brings his eye right up to the lens which lets me see outside. I know that he can't see anything inside, but I sit there, trembling with fear. I am as silent as a piece of slate.

After a minute he turns back to the lift and enters it with his girl.

I write in the book, 'The day I nearly died'.

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