Aquarium
No. 13 was still trudging fifty meters underground, or rather, he was ready to start swimming. The passage began to slope downwards, and the humidity in the passage became higher and higher. The condensed water droplets above dripped down with a crackling sound. He felt like he was walking in a rainstorm. The shallow puddle of water under his feet turned into knee-deep water, and every step he took was very strenuous. There was a red light flashing at a fixed frequency ahead, and No. 13 guessed that he was almost at the end. His feet were empty, he lost his support, and his body was completely floating in the water. The water was cold and salty, and it smelled like sea water, but fortunately it was clean and transparent. No. 13 was proud of being a good swimmer, so he plunged down. He r
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