Ten metres underwater, surrounded by darkness, all Dan Frolec could hear was the engine noise of the boat above him. It had been well over half an hour since his friend Tom had descended into a mysterious underwater hole to look for their other friend, Michael. Frolec began to fear the worst – maybe it had swallowed both of them up for good.
He had almost given up hope when bubbles of air hit his mask. Somebody was coming out. A dim light shone out of the cave and Tom emerged alone. He shook his head, signalling to Frolec that Michael was still lost and, by now, probably dead. Little did Frolec know that things were about to get a lot worse.
