TONI CIRER
Three months ago, Xisco Gràcia experienced what he describes as every diver's worst nightmare - he found himself in an underwater cave, relying on an air pocket for survival. As hours turned into days he realised he might not be found in time.
On Saturday 15 April, Xisco Gràcia slipped into the water in Mallorca for a routine dive. The geology teacher spent most weekends exploring and mapping the island's complex system of underwater caves.
"Mallorca is much more beautiful underground than above ground," he says.
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He and his dive buddy, Guillem Mascaró, wanted to explore Sa Piqueta, a cave with numerous chambers 1km from the entrance of the labyrinth. They swam underwater for an hour to get there.
While Gràcia spent time collecting rock samples, Mascaró swam off to chart a nearby chamber.
It was as they headed for home that several things went wrong at once. Gràcia met Mascaró by chance at a junction, and they stirred up silt from the ground, making it difficult to see.
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They then realised that their guideline - a narrow nylon wire which led back to the entrance - had either broken or slipped.
"The wire is for guiding purposes. It is left behind once you enter the cave and you can follow it out again afterwards," Gràcia, 54, says.
"We can only guess some rocks had fallen on it. We spent a precious hour trying to find it by touch, but without success."
By this point the pair were in grave danger. They had consumed the air they had brought to get them in and out as well as most of their emergency air.
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Luckily, Gràcia remembered that other divers had talked of an air pocket in a chamber nearby. He tugged Mascaró to it, and there they talked through their options.
Both knew they only had enough air for one of them to make it out.
"We decided I would stay and Guillem would go for help. He was skinnier than me and needed less air for breathing. I was also more experienced at breathing cave air, which has higher carbon dioxide levels," Gràcia says.
They planned an alternative, longer route out on a map. Mascaró would have to travel along some of it without a guideline and could potentially get lost.
"It would have been like trying to drive a car in a very foggy night," Gràcia says.
"Guillem was reluctant to leave me on my own but we knew it was our only chance."
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Once Mascaró had left, Gràcia took off most of his equipment and explored the chamber. It was about 80m (260ft) long and 20m wide, with a gap of 12m between the water and the ceiling.
He realised the water at the surface of the lake was drinkable. He also discovered a large flat rock and pulled himself out of the water to rest.
Gràcia decided he would have to manage without light. Two of his three torches no longer worked and the third was low on battery.
"I only turned it on when I went to pee or to climb down to get fresh water," he says.
There was little he could do now but wait, in complete darkness, and hope to be rescued.
"I asked myself why this had happened to me now after so many years of diving," Gràcia says.
"But I was hopeful during the first seven or eight hours as I thought Guillem would make it out. As time passed, though, I started to lose hope. I thought, 'Guillem has got lost and died and no-one knows I am down here.'"
Gràcia began to think about his loved ones above ground.
"I have two children, a son of 15 and a daughter of nine. I thought about how they were too young to lose their father and what would happen to them," he says.
Although he managed to remain calm, he began experiencing the effects of breathing in high levels of carbon dioxide. While the air we breathe above ground is 0.04% carbon dioxide, in the cave the level was as high as 5%.
"I had a headache and although I was exhausted through lack of oxygen it was impossible to sleep. My brain was whirring," he says.
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His mind began playing tricks on him.
"I got the feeling there were lights in the lake and I heard the sound of bubbles of a diver emerging.
"But when I turned my head I saw nothing. It was a hallucination."
Gràcia lost track of time but after what felt like days he heard a loud noise above him. He realised Mascaró must have made it out.
"I thought at first I could hear the sound of tanks being filled with air for the rescue team. Later I realised they must be trying to drill through the rock.
"I was really happy as I realised they were looking for me."
But then the noises stopped and Gràcia faced his darkest moment.
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