Conan stared at the mysterious letter in his hand, a flood of questions swirling in his mind. "Beneath the deep sea, undercurrents surge"—what kind of crisis lay hidden behind these brief words? Knowing he couldn't face this unknown challenge alone, he quickly summoned Ran Mouri, Ai Haibara, Yoru, and Lin Yu.

Everyone gathered at the Mouri Detective Agency, and Conan passed the letter around for everyone to read. After reading the letter, everyone's expression turned serious.

"This letter is suspicious. There's no sender, yet it seems to be deliberately reminding us of a crisis," Ran Mouri said, her eyes revealing worry.

Ai Haibara adjusted her glasses and calmly analyzed, "Judging from the contents of the letter, the crisis seems to be related to the deep sea. But we know nothing about the source of this letter, nor are we sure if it's a trap."

Nightshade frowned slightly, pondered for a moment, and said, "Whether it's a trap or not, we can't sit idly by. If there really is a crisis that threatens the public, we must prepare in advance."

Lin Yu rubbed his hands together excitedly: "Who cares? We'll face it together, and maybe we can solve another big mystery!"

Conan nodded in agreement: "That's right. Let's first gather information about the deep sea and see if we can find any clues. Lin Yu, use your high-tech equipment to search for any unusual situations in the deep sea area recently; Ai Haibara, consult various scientific materials to see if there are any records of unknown deep-sea phenomena; Ran, Yoru, let's visit some marine experts together to learn about the special conditions and potential dangers of the deep sea."

Everyone sprang into action immediately. Lin Yu returned to his studio, activated advanced monitoring equipment, and began a comprehensive scan of the global deep-sea region. He stared intently at the screen, not missing a single anomaly. After several hours of searching, he discovered some clues: in a certain area of ​​the Pacific Ocean, the magnetic field was exhibiting abnormal fluctuations, and the ocean temperature was also showing unusual changes.

Meanwhile, Ai Haibara scoured libraries and online databases, consulting a vast amount of scientific literature on the deep sea. She discovered a research report from decades ago that mentioned a mysterious energy reaction that might occur in specific deep-sea environments, potentially triggering a series of catastrophic consequences, including tsunamis and underwater volcanic eruptions.

Conan, Ran Mouri, and Nightshade visited several marine experts. One of the senior marine geologists told them that in certain areas of the deep sea, there exist geological structures that are not yet fully understood, and these structures may conceal enormous energy. Moreover, in recent years, they have also noticed subtle changes in the ecosystems of some deep-sea areas, with some organisms that originally lived on the seabed beginning to migrate to shallower waters, which may indicate that some major changes are taking place inside the deep sea.

After several days of investigation, the group gathered again to share their findings.

“I think all these clues point to that unusual area in the Pacific Ocean, which is very likely the source of the crisis,” Conan said, marking the location of the area on a map.

"But we know very little about the specific situation there, and it could be dangerous to go there rashly," Ai Haibara warned.

“In any case, we can’t just sit idly by. We need to prepare some equipment to deal with the deep-sea environment,” Nightshade said.

So they began preparations. Lin Yu used his high-tech knowledge to develop an advanced deep-sea diving system, including a pressure-resistant diving suit, a highly efficient oxygen supply system, equipment for maintaining communication in the deep sea, and a multi-functional helmet with lighting and detection capabilities. In addition, he also manufactured some small underwater robots to detect dangers in advance and collect information.

Ai Haibara has concocted a series of special medicines to deal with potential deep-sea toxins, physical discomfort caused by high-pressure environments, and other unknown situations.

Ran and Nightshade intensified their physical training to prepare for the complexities that might arise in the deep sea. They also learned some professional underwater combat techniques in case of emergency.

After some tense preparations, Conan and his companions boarded a research vessel equipped with advanced navigation and detection equipment and set off for the unusual area of ​​the Pacific Ocean. During the voyage, the weather gradually became gloomy, and the waves grew larger and larger.

"It seems we're about to face another challenge of bad weather." Conan looked out the window at the sea, his brow furrowed.

The captain reminded everyone over the loudspeaker: "Ladies and gentlemen, there may be a storm ahead. Please be prepared, make sure the equipment on board is secure, and do not move around unnecessarily."

Conan and the others quickly followed instructions, securing all equipment and supplies. Ran Mouri and Nightshade helped the crew furl the sails and adjust the ship's course to prepare for the approaching storm. Lin Yu, in the control room, used high-tech equipment to monitor weather changes and provide real-time information to the captain.

Inside the cabin, Ai Haibara and Conan were checking their diving equipment and supplies again to ensure everything was ready. Suddenly, a huge wave crashed in, causing the ship to rock violently and some items to fall from the shelves. Conan and Ai Haibara clung tightly to something stable nearby to avoid falling.

“In this kind of weather, diving operations will likely be even more difficult once we reach our destination,” Ai Haibara said.

“But we can’t back down; we must find out what’s going on in the deep sea as soon as possible,” Conan said firmly.

After battling the storm for several hours, the research vessel finally reached the vicinity of the unusual sea area. At this time, the sky was still covered with dark clouds, and the sea was turbulent.

Conan and the others donned their diving gear, preparing to dive into the deep sea. Lin Yu first released several small underwater robots to explore the underwater environment in advance and transmit real-time images and data.

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