The muddy current of the Chao Phraya River formed a vortex at the entrance of the cave, and Tang Ren's golden silk Tang suit was tangled with water plants. He took out a waterproof compass, and the copper Tianchi was actually keeping a balance at the bottom of the river: "The water level of the Kan Palace, the handle of the dipper points to the east - swim to the Zhen position!" The fluorescent pointer drew a cold light in the darkness, and he followed the direction of the Beidou vine pot and dived into the cave.

The chisel marks on the cave wall were revealed under Su Chen's headlamp: "These are traces of gas drilling from sixty years ago." He scraped off the rock chips and put them into a sealed bag, "It matches the engineering equipment from the time when the 'Hai'an' was discovered." Qin Feng suddenly tapped the oxygen cylinder, and the flashlight illuminated the fork in the road ahead - seven cave entrances were arranged in the shape of a Big Dipper, each inlaid with the remains of a gilded Buddha.

"Tian Shu is a greedy wolf, Po Jun is in the west!" Tang Ren tore off the Pi Xiu necklace on his neck, and the jade pendant rolled into the first cave. The monitor heard the sound of metal collision, and Su Chen's sound map showed that there was a closed space deep in the cave. When Qin Feng squeezed into the narrow waterway, his diving goggles were distorted by the rapids, but he accidentally caught a glimpse of the inscription on the top of the cave - the date of July 16, 1946 and a set of geographical coordinates.

In the closed cave, ten incomplete golden Buddhas formed a circle. Tang Ren's compass suddenly stuck to the central stone platform, and the moisture-proof box was exposed under the bluestone slab. When Su Chen's laser cutter was unlocked, Qin Feng noticed that the epoxy resin at the seam of the box was a military material that was not popular until 2010.

"Look at this!" Tang Ren shook out the damp account book in the box. The logo of a jewelry brand could be vaguely seen between the mold spots. Su Chen used a multi-spectral scanner to restore the original handwriting: "In July 1946... I took out a loan from HSBC Bank with twelve golden Buddha statues as collateral..." He suddenly paused, "The loan was signed by the current jewelry tycoon Zu."

Qin Feng suddenly pulled over the waterproof board, and with trembling fingertips he pulled up the design drawing of the exhibition hall: "The blind spot of the security system..." He stuttered and circled the direction of the ventilation duct, "It's the same as the signature on the loan agreement!"

The sound of an engine roared from outside the cave. Tang Ren grabbed the Buddha's ear hidden weapon and threw it into the water: "There's a lackey!" When the searchlight pierced the darkness, Su Chen found the RFID chip attached to the bottom of the stone platform - it was the first locator he developed, and he had demonstrated the prototype at an academic conference a month ago.

"There's a traitor in the lab!" He broke the wafer, and the LCD screen showed the last location record: Bangkok University Materials Laboratory. Qin Feng suddenly spit out water, and the LCD screen showed that the oxygen content in the cave dropped sharply. Tang Ren picked up the bronze Buddha head and smashed it against the cave wall, and the gas pipe of the micro oxygen generator was exposed in the crack.

Climbing along the pipeline to the underground river, Tang Ren's Tang suit became a filter net, covered with algae. When he surfaced, he saw an abandoned rubber processing factory. On the rusty conveyor belt, 76 wooden boxes were neatly arranged, with faded stamps of "Royal Siam Cargo 1946".

"This... this is..." Qin Feng pried open the wooden box. The moisture-proof cotton was not wrapped in rubber, but bundles of Nanyang Shipping stocks. Su Chen scanned the watermark with a microscope helmet: "The stock is made of special anti-counterfeiting paper, containing nano-gold particles - the same composition as the coating of the Buddha statue in the exhibition hall."

Suddenly, Tang Ren's compass needle spun wildly and pointed to the northeast. He kicked open the rotten wooden box, revealing the ship's transmitter hidden on the bottom floor. The moment Qin Feng turned on the power, Morse code automatically broadcast: "...July 16, the typhoon changed the plan, and the goods were transferred to the warehouse..."

"Look here!" Su Chen polished the transmitter case. The logo of a jewelry brand was exactly the same as the one on the account book. He disassembled the transmitter base. The production number on the circuit board pointed directly to the laboratory of the Department of Electronic Engineering of Bangkok University, his alma mater.

The rainstorm came again. Tang Ren wrapped the key evidence in gold foil: "The wind is rising in Xun Palace. It's time to meet Zheng." He tore off half of the account book and stuffed it into the Buddha's ear. "This master wants to meet that gold-plated Bodhisattva!"

As Xiaoxiao rushed out of the factory, seven black cars were rolling through the mud. In the rearview mirror, the jewelry tycoon's personal bodyguard approached with a metal detector. Su Chen hid the evidence wafer into Tang Ren's jadeite Pixiu, and Qin Feng suddenly stuttered and shouted out the key: "The account... the account page... there is... there is a chemical formula!"

Tang Ren bit open the micro camera with his gold teeth and took continuous pictures of the formula: "This is an improved version of the 'burning alchemy' in 'The Exploitation of the Works of Nature'!" He swung out his folding fan to smash the street lamp. In the rain of glass, Su Chen caught a glimpse of the cobalt and chromium ratio in the formula - it was the key ingredient of the hallucinogenic poison gas.

At the end of the dark alley, a rusty iron door was hung with a remnant sign that read "No. 1 Warehouse". When Tang Ren's Luoyang shovel got stuck in the pursuer's leather boots, Su Chen's sonic resonance device unlocked. On the dusty conveyor belt inside the door, twelve complete gilded Buddhas glowed coldly under the searchlight - the nano-coating at the Buddha's eyes was exactly the same as the sample number in Su Chen's laboratory.

The roof of the warehouse suddenly exploded, and the helicopter blades stirred up a golden dust storm. The jewelry tycoon stood by the cabin door, with "HP" engraved on the chain of the pocket watch in his hand. "Seventy-six years of reincarnation," he opened the lining of his suit, and the same star map as the lame old man was tattooed on his heart, "It's time to inherit the will of the Hai'an."

Tang Ren suddenly threw out the Emperor's Coin to smash his watch, and the stolen coating technology paper of Su Chen fell out of the dial. The rainstorm washed away the evidence of the gilded Buddha's body, and the Morse code in the cave at the bottom of the river was still automatically transmitted, with the frequency pointing directly to the encrypted channel of the Criminal Investigation Headquarters...