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抗战时期的重庆，有一个代号“人头山”的单位，神秘而传奇。这实际是抗战时期国民政府军委会技术研究室（以下简称“军技室”）的下设机构。

说它传奇，是因为“人头山”截获的电报，提前四天确定了日军将偷袭珍珠港。此外，还提前截获了山本五十六的出巡日程电报，美军根据这一电报，派出16架战斗机拦截，击毙山本五十六。

说它神秘，是因为它是军技室里密级更高的、负责侦听的第四组所在地，这也是唯一没有与军技室在一处的小组，“人头山”当年甚至号称连一只鸟也飞不进去。即使在抗战结束后的很长一段时间，其具体所在也是一个谜。

这次，自助游达人“寒溪夜浣”带我们寻访这个神秘的人头山。

During the war of resistance against Japanese aggression, there was a mysterious and legendary unit code-named "Rentou Mountain". In fact, this was a subordinate organization of the technical research office of the Kuomintang military commission during the Anti-Japanese War (hereinafter referred to as the"military technical office").

It was called a legendary unit because it confirmed four days in advance that the Japanese would attack on Pearl Harbor from the telegram it intercepted. In addition, this unit also intercepted the tour schedule telegram of Yamamoto 56 in advance.Based on the information from this telegram, the United States army sent 16 fighter jets to intercept and killed Yamamoto 56.

It's mysterious, because it was where the fourth, more advanced interception group of military technology room located.This was also the only group that didn't share the same location with the military technology room. "Rentou Mountain"claimed that even a bird could not fly in. Even long after the end of the war, its exact location was still a mystery.

This time, the independent travel master "Hanxi Yehuan" took us to visit this mysterious Rentou Mountain.

何处“人头山”

Where the “Rentou Mountain” locates ?

上：抗战时期，洋人居住的地方，现在看来，也分外隐蔽

下：军技室总部曾挂着“中央工业实验所”的牌子掩人耳目

“寒溪夜浣”的攻略，多见于《孤独星球》或是携程、蚂蜂窝等网站，常常被历史爱好者作为探秘访古的指南。这个量子力学专业的理工男介绍，随着历史的迷雾尘埃落定，当年的谍报机关军技室也渐渐掀开了神秘的面纱。对于军技室总部所在的刘家花园，历史专家和谍迷群体目前能够确认的是，就在黄桷垭现重庆中医药研究所里面，而最神秘的“人头山”，就在它的对面，今凉风垭洪家坡六角村的位置。

前往“人头山”，需从重庆邮电大学旁的黄明路往凉风垭森林公园方向上山，走到洪家坡公墓后继续步行，一直走上山顶。

方位虽然明确，但要真正进入却并不容易。走过这一段路后，“寒溪夜浣”才终于明白，为什么这里在抗战时期能够如此隐蔽。道路入口横亘在笔直的陡坡上，用青石板铺砌，非常险要，这条青石板路也是整个区域唯一的一条进山路，其它地方连攀岩都非常困难，加上哨兵密集，外人根本无法觊觎。

据说当年入口道路周围的树木全被砍得一干二净，只剩下光秃秃的陡坡，只要有人由此上山，就完全暴露在哨兵的视线里，无处遁形。

沿着山路蜿蜒而行大约两公里后，可见一个土石混合的平房，据说当年曾是供美国人居住的。屋前有片开阔的田地，屋后的坝子是个废弃的篮球场，坎下还有水井。

平房建在一个相对孤立的半岛形状的山坡上，三面悬崖，深沟里有小溪流过，成为一条天然的分界线，也成了不可逾越的鸿沟。当年，如果越过这条小溪，就相当于你从这个世界上消失了——再往里走1公里便是最核心的区域，树木茂密，杂草齐肩，你再也走不出来，或者里面的人也不再让你走出来。

Most of “Hanxi Yehuan”’s travel tips came from Lonely Planet or websites like Ctrip and Mafengwo and are often used by history buffs as a guide to explore the past.The guy with the degree in Quantum Physics counted that as the mysteries of the history begin to unravel, the veil of the Military Technical Office for Intelligence was gradually removed. For history experts and spy community, one thing they know for sure is that the Liu’s Garden where the Military Technical Office resides is in Chongqing Traditional Chinese Medicine Institute of Huangjiaoya. And the most mysterious “Rentou Mountain” is on its opposite, the Liujiao Village, Hongjiapo, Liangfengya.

on the “Rentou Mountain”, you need to go up the mountain from the Huangming Road next to Chongqing University of Posts and Telecommunications to the Liangfengyu Forest Park. After walking to the Hongjiapo Cemetery, continue walking till you reach the top of the mountain.

Although the location is clear, it is not easy to get there. After walking through this part of the road, “Hanxi Yehuan” finally understood why it was so secluded during the Anti-Japanese War. The entrance to the road, which runs along the steep slope and is paved with bluestone stone, is very stiff. This bluestone road is also the only path to the mountain region and it’s also very difficult to climb in other places. In addition, the place is full of sentinels and chances for outsiders to covet are slim.

It is said that all the trees around the entrance road had been cut down, leaving only a bare escarpment, from which any one who ascended it would be exposed to the sentinels.

About two kilometers down the winding mountain road, there is a bungalow made of mud and stone. It is said to Americans used to live here. There is an open field in front of the house, behind the dam is an abandoned basketball court, where wells can be found.

Built on an isolated and peninsula-shaped hillside,the bungalow is surrounded by cliffs on three sides,with streams flowing through deep ditches, forming a natural dividing line and an insurmountable chasm. Back in the day, if you crossed the stream, you might have disappeared from the world. A mile further down is the core area with shoulder-high weeds and dense trees. The odds that you can get out of the place are slim. Probably because the people inside won’t let you out anymore.

当年的射击警戒口

深山藏密洞

Secret Cave in the Remote Mountain

穿过杂草丛，眼前突然出现众多山峰。

群峰之中，有个山峰着实特别，它突兀于群峰环绕的沟壑之中，三面悬崖，唯有一狭长的山脊与另一峰相连。它的真实容貌，确如当事者回忆录上所写，酷似人头，顶上草木茂密，四周崖壁刀削，中间凹凸有致如同五官。据说当时负责侦听的第四组选址于此，就是因为周围的环境如同一个聚波的大锅盖，而一柱擎天的山峰又如一根天然的天线，凹凸五官则能起到耳朵的作用，是不可多得的绝佳侦听之所。

沿绝壁向着人头山前行，路边还藏着一个L形状的小房子，小房子四周暗堡密布，走进屋内，依稀可见西式壁炉、放置柴油发电机的台座。

“寒溪夜浣”推测，这里应该是为侦听组运送物资的马匹卸货的马场，也是进入神秘的人头山前接待和审核的最后一道关隘。只有从这个小屋的门厅通过，然后从L形状的小房子中间的坝子穿过，才能到达那个终极秘密的入口——隐藏在凹陷山壁里面的天然洞穴。

洞穴内设计精细，由几条相对独立的U字形隧道组成

洞穴入口上方，有一片参天的黄桷古树，早已盘根错节把整个洞口包裹，加上比人还高的杂草，如果不是有备而来，即使围着房屋找寻，也根本不会想到这里面竟然另有玄机。

即便如此，在周围的几座山峰里，依然布置了几个同样隐藏严实的洞穴作为疑洞，以迷惑可能“造访”的外来者。

走进洞穴，里面隧洞纵横交错，宽窄不一，凹凸不平，似乎整个山峰都已被挖空。仔细搜寻则可发现，迷宫般的洞穴设计精细，由几条相对独立的U字形隧道组成，正好符合谍报部门相互保密的需要。后人猜测，每条隧道应该就是一个科室，分别担负不同任务。

一切尘埃落定，“寒溪夜浣”关上手电，静坐洞中。周围一片漆黑，深邃得似乎正在将人慢慢拖进历史的时空隧道，风从洞口掠过的声响，似乎更像人头山在喃喃自语，将无数埋藏其中的秘密一一道来。

Through the long grass, mountains suddenly appeared before our eyes.

Among them, one mountain peak was particular.It stands out from the ravines that surround it and has cliffs on three sides, and only a narrow ridge connects one peak to another. Its real appearance, as written in the memoirs of the person concerned, resembles a human head which has lush vegetation on the head, stiff cliff around and man-liked features in the middle. It is said that as the surrounding environment is like a large pot cover, and the peaks of the sky like a natural antenna, the fourth group of interception was located here. In addition, its distinctive facial features can also serve as ears. Little wonder it is a rare perfect place for interception.

Along the cliff toward the head of the mountain, a small L-shaped house was hidden along the roadside.The small house was surrounded by dense dark fort. Inside the house, a western fireplace and diesel generator pedestal can be found in the dim light.

“Hanxi Yehuan” speculated that it should be a horse farm for the inception group to unload the supplies of the horses. And it is also the last pass connecting to the mysterious Rentou Mountain for reception and examination. Only through the vestibule of the hut,and then through the bashi in the middle of the L-shaped house, can one reach the entrance of the ultimate secret-- the natural cave hidden in the hollow mountain wall.

Above the entrance to the cave, there is a tall ancient Huangjue tree District. It has already wrapped the whole hole with its roots and its tall weeds. If you are not prepared, even if you are looking around the house,you will never think that there is something else going on.

Even so, several equally well-hidden caves are arranged in the surrounding mountains as suspicious caves to confuse outsiders who might “visit”.

Walking into the cave, the tunnels are crisscrossed, wide and narrow, uneven, and it seems that the entire mountain has been hollowed out. A careful search reveals a labyrinth of intricately designed ushaped tunnels, suitable for the secret service’s need for mutual secrecy. Now people speculates that every tunnel should be a section office with different task.

When everything is settled, “Hanxi Yehuan”turned off the torch and sat quietly in the cave. The surrounding area is dark, and it seems that people are slowly being dragged into the historical time and space tunnel. The sound of the wind passing through the mouth of the cave seems to be more like the murmuring of the human head, revealing the countless secrets buried in it..