I opened my eyes. My heart had stopped beating like a drum, and the worst of the panic attack had passed. I waded slowly down the corridor, searching for a marker. If I could find one, I was sure I'd recall the rest of my mental map. I reached the end of the corridor — no markers. The next corridor was also new to me. And the one after that. And the next.

I could feel the panic bubbling up again when I spotted a candleholder set in a pale grey circular stone — one of my markers! I stared at the candle and waited for my map to reform. For several long seconds my mind remained as terrifyingly blank as it had been — then the map fell back into place. It came to me in sections first, a piece at a time, then in a rush. I stood where I was for a few more seconds, making sure I had it clear in my head before continuing.

The water was up to my lower lip now. The movement was almost impossible. I had to proceed in sluggish jumps, lurching forward to keep my head above water, being extra careful not to bash it on the ceiling. How long before I ran out of air? Three minutes? Four? It couldn't be much more than that. I had to find the way out — and quick!

Concentrating on the map inside my head, I tried figuring out how far away I was from the spot where I'd started. By my calculations, I should be near one of the border walls. If I was, and the exit door was close by, I stood a chance. Otherwise the Trial was as good as over.

Turning a corner, I ran into my first stretch of border wall. I knew it immediately, because the stones were darker and rougher than the rest of the maze. There was no X printed on it, but my heart gave a joyous leap anyway. Backtracking, I banished the map from my thoughts — it was no use to me anymore — and hurried to the next turn, searching for that elusive X.

I found four different sections of border wall, none of which contained the exit. The water was almost up to the ceiling now. I was swimming more than walking, pressing my lips to the ceiling to draw in air. I'd have been OK if it wasn't for the horrible rock — it dragged behind me worse than ever when I tried to swim, slowing me down to a crawl.