The Gods of Atlantis by David Gibbons

where they had left the submersible. They were now completely cut off from outside support, dependent entirely upon themselves and their equipment, facing a challenge fraught with as much risk as they had ever faced before. Jack turned and looked into the swirling darkness below them, reducing his headlamp beam so his vision was not dazzled by the reflection of light from particles in the water. He saw the hazy outlines of the tunnel walls ahead, and the blackness beyond. He felt his breathing tighten, felt the apprehension, and then took a deep breath and relaxed as theadrenalin coursed through him. He was in his element, where all his training and ambition had led him, an underwater explorer about to enter the most extraordinary archaeological site ever discovered. Right now, there was no better place in the world to be. Costas turned to him, his visor reflecting an image of Jack like a photograph of an astronaut in space, then gestured down the tunnel. ‘Good to go?’
    Jack steeled himself.
They were about to dive into a live volcano
. He raised his hand, then pointed into the void. ‘Good to go.’

2
     
    J ack stared down into the narrowing void ahead of him, keeping part of his mind on the smudge of light he knew lay some thirty metres behind them at the entrance to the tunnel. It was like a flash imprinted on his retina, and he tried to hold it there as a reminder that they had an escape route. He looked over at Costas, remembering their shared experience in the mineshaft many years before. They had let all their training and experience kick in, working the rescue methodically from the moment he had jammed his tank valve on the timber and his air had cut off. The problem for Jack was the reflection, years later: what if Costas had not been face to face with him at that moment, when he had struck the timber and dropped their only torch, plunging them into darkness?
    Jack had worked hard to turn the nagging uncertainty to his advantage, convinced that it made him a better diver, more alert to danger, but always for a few moments before a dive like this one he had to go through a ritual. He shut his eyes tight, thinking about nothing, deliberately slowing his breathing, remaining spread-eagled and neutrally buoyant. After a moment he took a deep breath, opened his eyes and looked at his wrist readout, checking the depth and temperature.He felt a nudge beside him, and heard Costas’ reassuring voice. ‘You done?’
    ‘All set. You lead, or me?’
    ‘It’ll have to be you, Jack. I don’t think I could get around you now, with Little Joey hitched to my front. I’ll be about five metres behind.’
    ‘Roger that. I’m about to begin my descent.’
    ‘Watch your external temperature gauge. Remember, it should read no more than a hundred and twenty degrees. We have about sixty metres more in the tunnel before we reach the area we passed through five years ago, on the way up to the inner sanctum.’
    ‘You mean the magma chamber, full of red-hot lava.’
    ‘At least we won’t have to use our torches.’
    A few years before Jack had been in an IMU submersible off the Kīlauea volcano in Hawaii, watching lava pour over the seaward cliffs and roll down the underwater slopes in a glowing orange mass until it had congealed. He had found it a disconcerting experience, with all his instincts telling him that the water around the lava should have boiled and vaporized, and he had wanted to reverse the submersible to avoid falling into the vacuum he felt sure would appear above the flow. And now here he was, not in a submersible but in the water himself, about to swim into the same scenario. He flexed his fingers, looking at the bulbous white Kevlar that was the only barrier between himself and whatever fiery mass lay ahead. He glanced at the readout inside his helmet, seeing the green light showing that the small electric motor running the air-conditioner unit inside his suit was functioning. He pressed his intercom.