One Sunday last year, eight of us hiked for a couple of hours through the desert near San Diego to reach Thunder Canyon Cave. We had to go through a waterfall to get inside, so we put on our wetsuits and lowered ourselves 30ft down. By 11：00 am we were inside. With further climbing, we reached a nineinch crack. Having caved for four hours,__I was tired and wet.
The group leader, Luca,__was guiding three cavers. One of them, Steve, in his 50s, got jammed in the__crack. There was 10 minutes of pulling and pushing until Steve was free. He was tired and needed to leave. Luca, assuming I'd been through the crack before, guided Steve through another 15 minutes of cave to an exit. I was second from last to go through and out of earshot (可听距离). I didn't realize that Luca wasn't there—if I'd known, I wouldn't have attempted the crack, as I needed an experienced guide.
The challenge is to move your feet first down the length of the crack, and then angle your body sideways to swing along, before dropping five feet to the floor of the next space. On my first attempt, I knew I wouldn't make__it through, but the group encouraged me to try again. I didn't want to inconvenience anyone by having to make the long trip back through the cave, so I backed out and took off my wetsuit. In just my Tshirt, I tried to slide through again but my hips (屁股) jammed. My feet were hanging the other side and my left arm supported my body. My hand rested on a wooden board that had been left covering rocks to protect cavers from slipping. Luca returned and the team tried everything to move me as I mentally focused on escape.
After two hours my arm weakened, so I slid further into the crack, where the__gap was only eight and a half inches wide. My body weight was now on my left elbow, my back and chest touching the cold stone walls. The guy behind me, Jim, tried unsuccessfully to pull me back. Of course, I was blocking his escape,__too.
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Paragraph 1：
With the risk of hypothermia (低体温),
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Paragraph 2：
Luca finally found the rescue helicopter.
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