Sugiyama made up his mind: there could be no turning back now that they had come this far. He resolved to see this through to the end.
Tying a rope round a rock, Sugiyama released the other end, and it fell towards the bottom of the shaft. Although he felt capable of scaling the shaft without a rope, he wanted to take every precaution to ensure a safe return.
'Wait here.'
The tone of Sugiyama's command was calm, yet clearly a command. Although the two men were the same age, Sakakibara was Sugiyama's senior in terms of the number of years he had been a Pilot Caving Club member. It was thus with reluctance that Sakakibara nodded in compliance with what amounted to an order from a junior. Despite their relative positions at the club, Sugiyama far surpassed Sakakibara in terms of caving technique. Given the precariousness of the footing, one of them had to remain at the edge of the opening to make sure that the end of the rope remained in place, and Sakakibara was more suited to this task.
As Sugiyama lowered himself inside the shaft, he felt apprehensive once again. He wondered why, but simply attributed it to Sakakibara's annoying whistling. The man was looking down at him coolly now, all the while whistling some cracked tune. Sakakibara was all too relaxed, and this gave Sugiyama a nasty sense of foreboding.
Putting his foot on a small ledge, Sugiyama assumed a rest position. He began to contemplate the nasty premonition he had just had. This was supposed to be a virgin limestone grotto, one which no human had ever set foot in until now. Yet an uninvited flash of intuition suggested to him that sometime in the distant past, someone had tried to access this shaft just as he was attempting to now. It was an impression that must have formed unconsciously from having glimpsed some evidence of a prior presence.
He brought his headlamp closer to a stalactite. The longer he inspected the wall, the more apparent became the bizarre pattern fashioned there. Daubed onto the contrasting ochre of the cave surface was dark-gray mud. He stretched out his hand to feel the surface. The pattern was clearly different from the cave surface. He wondered whether it was a motif that someone had intentionally fashioned there. No, he felt sure that wasn't the case. He concluded that it was more likely to have been a muddy stain on the back of someone who had passed through the shaft just as he was doing now. As this person had been passing through, the mud on his back must have rubbed off onto the limestone wall.
Sugiyama felt his energy rapidly ebbing away. The only reason he'd been tempted to this madcap adventure was the belief that no man had ever set foot in this grotto before. There was all the world of difference between being first and being second. Viewing this as a good a time as any, he called out to Sakakibara. As soon as he shouted, however, a hail of small stones struck him in the face. He immediately covered the top of his helmet with both hands for protection. Once the stones stopped falling, he looked up to see Sakakibara's blue overall-clad form bumbling about, and then enter and block the shaft.
'Say, Sakakibara!' he shouted even louder.
'Hang on! I'm coming down!'
Unable to contain himself, Sakakibara appeared to be lowering himself down the shaft, feet first.
'No, get out of there!'
Their ensuing argument over who was going down or up lasted but a few seconds. A sudden shower of small stones was immediately followed by a loud boom, a brief scream, and the horrible sound of crushing bone. Then, as quickly, the shower of stones subsided. The lower half of Sakakibara's body blocked the mouth of the shaft, preventing Sugiyama from appreciating the extent of the catastrophe that had just befallen him.
'What's happening up there?'
He voice began to quiver, for he already instinctively knew that something was very wrong. Sakakibara failed to respond, but a short moan percolated through the gloom instead.
Sugiyama made his way up until he could feel Sakakibara's feet on his head. He flashed his light up through the gap between Sakakibara's waist and the wall of the shaft. To his amazement, the space above the mouth of the shaft was no longer open; it was blocked by the boulder.
He was stupefied. He felt the blood drain from his head. As he braved the dizziness, he regretted that they hadn't properly secured the boulder. With every rock-slide, the boulder had tilted under its own weight to fall back to its original position, encountering and crushing Sakakibara's head in the process. It was too cruel a punishment to be meted out to someone for simply having deserted his post. Yet Sugiyama could not suppress his desire to curse Sakakibara for his stupidity.
The beam of his flashlight caught the ghastly white of Sakakibara's jaw, under which the sinews of the neck were strained tight. His head was wedged between the side of the shaft and the edge of the boulder so that Sugiyama could not see the face from the nose up. For some time, Sugiyama just stared in blank disbelief. His legs trembled, and he felt nauseous.
'Are you okay?' He tried to say this, but the words would not come out of his parched mouth.
Yet the truth was only too obvious. No amount of talking would make any difference now. Down the strained neck ran thick rivers of blood. Sugiyama was on the point of reaching out for Sakakibara's foot to check for signs of life, when suddenly Sakakibara's body arched backwards and began to convulse. The movements were too unnaturally spasmodic to be anything but the throes of death. His eyes transfixed by the horrendous sight, Sugiyama shivered and tasted bile.