“Let me give you a breather,” Dirk said, grabbing the file from Summer with his free hand. The release of his right hand gave him a few extra inches of breathing room, but it was not enough to file the last mooring ring without submerging. Taking a deep breath, he ducked under the surface and began filing rapidly on the ring that held down his left wrist. After thirty seconds, he bobbed to the surface, sucked in some fresh air, and plunged back under. Summer stretched her cramped fingers, then swam to Dirk's left side and waited for him to surface. Like a pair of tag team wrestlers trying to floor Hulk Hogan, they passed the file back and forth and ducked underwater, attacking the iron ring with muscle and fervor.
As the minutes wore on, the water level in the cavern crept higher and higher. Each time Dirk surfaced for a gasp of air, he felt himself stretching farther and farther to raise his mouth and nose above water. The handcuff shackle on his left wrist dug into his flesh as he instinctively yanked hard to escape the clutch of the massive barge weight.
“Save your strength for getting out of here,” he told his sister as the inevitable truth drew closer that they were running out of time. Summer said nothing as she grabbed the file out of his hand and plunged back beneath the surface. Dirk half-floated with his head tilted back, his face just barely out of the water, drawing a few deep breaths. He could feel the water wash over his face in ripples and stretched for one last deep breath before pulling himself under. Grasping Summer's wrist, he pulled the file out of her hand and began a last furious rush at cutting through the iron. Feeling the gouge with his thumb, he could tell that they had cut only a third of the way through. There was just too far to go.
The seconds felt like hours as Dirk made a final effort to break free. He could feel his heart beating like a bass drum as it struggled to pump oxygen into his depleted blood. In the murkiness, he could feel that Summer was no longer by his side. Perhaps she had finally taken his advice and sought escape. Or perhaps she just couldn't bear to be with him during his final gasp of life.
He paused from filing for a second to try pushing his weight against the ring. He could generate little leverage, however, and the iron ring held firm. Again, to the file he went, making furious strokes with the flimsy metal blade. His ears began pounding with each beat of his heart. How long had he been holding his breath now? A minute, two minutes? It was difficult to remember.
Light-headedness fell over him as spots began to creep into his vision. He exhaled what remaining air was left in his lungs and fought the temptation to open his mouth and gulp in. His heart pounded stronger and it became a mental fight against succumbing to panic. A light current seemed to push him away from the mooring ring, but his hand muscle grasped the file tightly in a death grip. A white veil was being drawn across his vision and a distant voice inside was telling him to let go. As he fought a last battle with the voice, his ringing ears detected a deep thump and then a strange vibration rippled up his arm and through his body just before his mind tumbled into a dark and empty void.
Summer knew that they were at least twenty minutes from filing through the iron ring and that there would have to be another way to free her brother. Abandoning Dirk, she dove to the cavern floor, searching and groping for another tool or device, anything that would help break the manacle. But the flat, sandy bottom yielded nothing, just the row of mooring weights, one after the other. Kicking ahead with one hand guiding along the blocks of concrete, she touched a large chunk of concrete that had broken off one of the weights when it had been dropped too close to another. Gliding beyond the debris, she reached the last block, where she felt something flat and squishy like soggy leather fall away in her hand. A harder piece beneath it was narrow and curved, which she identified as the sole of a boot. A stick leaned against it, which she started to grab, then let go in horror. It was no stick, she could tell, but the femur bone of a skeleton that was still wearing the boot. Another victim of Kang's savagery, the corpse had long ago been left chained to the anchor. Recoiling, she turned to swim back toward Dirk and bumped her head square into the fallen chunk of concrete. The broken piece was roughly square shaped, weighing about ninety pounds. She surveyed the block with her hands to get around it, then hesitated. It might be the answer, she decided, and was the best she could do under the circumstances.
Kicking up for a quick breath of air, she dove back down and muscled the block off the floor and up to her chest. On dry land, she would have struggled mightily to lift the heavy weight, but underwater the block was more yielding. Moving quickly, she shuffled down the row of weights to her brother, fighting to keep the chunk balanced. Feeling rather than seeing Dirk, she turned and backed into her brother, pushing his body away from the block that held his left wrist. She noted apprehensively that his body gave way rather limply, unlike his normal stone like stature.
Lining herself up with the mooring weight as best she could, she took a step and lunged forward, throwing herself and the broken chunk of concrete at the iron ring. In a slow-motion haze, Summer floated through the water with a slight ripple before the effects of gravity took over. But her timing was perfect. In the fraction of a second before her forward momentum was replaced by sinking gravity, the concrete chunk hit home on the iron ring. An audible clang, muffled by the water, told Summer that she was on target as she let go of the block. The rusty mooring ring, weakened just enough by the frantic filing, succumbed to the weight of the blow and snapped neatly off the anchor.
Summer immediately grabbed Dirk's arm and felt down to the wrist, which now dangled loosely. In a burst, she pushed her brother to the surface, took a deep breath of air herself, then towed his limp body to a small rock ledge, pulling him up and out of the water. She knelt by his side to administer CPR when his body suddenly stirred, his head turning to one side. With a groan, he expunged a small flood of water from his mouth and replaced it with a heaving lungful of air. Rising unsteadily to his elbows, he turned to Summer and gasped, “I feel like I drank half the river. Remind me to stick to bottled water next time.”
The words barely gurgled out of his mouth when he leaned over and retched a second time, then sat up and rubbed his left wrist. Eyeing his sister, he was pleased to see she appeared unharmed and in good spirits.
“Thanks for pulling me out,” he said. “How did you finally get the ring off?”
“I found a loose chunk of concrete and flung it against the stanchion. Thankfully, I didn't take your hand off in the process.”
“Much obliged for that,” he muttered, shaking his head.
After catching their breath, they rested for nearly an hour, slowly regaining their strength as Dirk purged the remaining water from his lungs, inhaled moments before Summer broke the iron grip that had nearly drowned him. What lit de sunlight that earlier wafted through the mouth of the cavern had long since vanished with nightfall, leaving them prone in the cave in near-total blackness.
“Do you know the way out of here?” Dirk asked once he felt fit to move.
“The mouth of the cave is less than fifty meters away,” Summer said, “just a short distance to the east is Kang's dock.”
“How'd we get in here in the first place?” he asked.
“A small skiff. I forgot that you slept through the scenic portion of the cruise.”
“Sorry I missed it,” Dirk replied, rubbing a small gash on the top of his head. “We'll to have to borrow a boat from Kang if we want to get off this rock. There was a small speedboat tied up behind his floating palace when we came in and docked. Maybe it's still there.”
“If we can untie it from the dock and drift it out into the cove undetected before starting it up, it may buy us some more time.” Summer shivered as she spoke, her body feeling the effects of the cool river dousing.
“Back in the water, I'm afraid. You know the way out, so lead on.”
Summer ripped the side seam of the silk dress up to her hip to allow more freedom for swimming, then slipped back into the cool murky water. Dirk followed as they swam and groped their way along the narrow winding cavern, moving toward a pale gray circular patch of light that faintly shimmered against the surrounding darkness. The murmur of distant voices gave them a momentary pause as they approached the cave's exit. Swimming around a tight bend, the oval mouth of the cavern opened up before them, the night sky twinkling with starlight while the glittering reflection of Kang's dockside floodlights danced about the water's surface. Dirk and Summer swam silently out of the cavern entrance to a small rock outcropping a few yards away. The algae-slickened boulders afforded a safely concealed vantage point from which they could observe the dock and adjacent grounds.
For several minutes, they hung quietly against the rocks, studying the moored boats and shoreline for signs of movement. There were three boats tied up to the floating dock that ran parallel to the shore. Just as Dirk recalled, a small green patrol speedboat was wedged between Kang's large Italian luxury yacht and the high-speed catamaran on which they had arrived. No signs of life were visible on any of the three boats, which were all tied up in a row bow to stern. Dirk knew that a small live-aboard crew would be present on the larger vessel.