大溪居民對於公會堂附近設有地道一直都有不同的傳聞，根據〈大溪公會堂暨蔣公行館展示研究及規劃設計案〉中的訪談成果匯整出四項說法：
一、地道是林本源家族的逃生通道，從大溪國小前方運動場通往舊時碼頭出口。
二、地道從行館延伸到崖線下方的防空洞出口，出口在日本時代曾為垃圾場。
三、查總統府檔案中也有防空洞、地道的預算規劃與平面圖，當時概算耗資約近70 萬元設置，地道長約五、六百公尺，通往河床。防空洞也可能是方便與河床對岸的中正理工學院照應，進行協助撤退或支援行邸任務。
四、蔣中正總統侍衛涂有景指出，地道是為總統安全而設。茄苳樹下的崗哨地坪附近曾是地道入口，在還未到大溪橋之崖邊有出口。涂曾隨同總統下去巡視，並為其打探照燈，大約在民國63、64 年即以水泥磚封蓋地道。目前出口處探查不易，且這項說法與總統府檔案中的紀錄也有出入。
Daxi townspeople share a miscellany of versions on the existence of an underground tunnel near the Assembly Hall. According to interviews gathered from A Conclusive Report on the Exhibition Studies and Planning and Design of the Daxi Assembly Hall and Chiang Kai-shek’s Residence, we curated four editions:
1. The underground tunnel was the evacuation pathway for the wealthy Lin Ben-yuan Family that exited out of the old wharf connecting the playground fronting Daxi Elementary School.
2. The tunnel runs the length between the Assembly Hall and the bomb shelter exit underneath the ridgeline. The exit was used as a landfill in the Japanese Colonial Era.
3. The archives of the Presidential Office also include budgetary planning and a floorplan of a bomb shelter and an evacuation tunnel. At the time, the project cost close to NT$700,000 to build. The tunnel ran a length of five to six hundred meters leading to the riverbed. The bomb shelter was likely set up to facilitate communications with Chung Cheng Institute of Technology, National Defense University, located on the opposite embankment of the river to expedite evacuation or support missions for the presidential residence.
4. President Chiang’s guard, Tu Yu-jing explains that the tunnel was set up for presidential security. The area encircling the sentry under the bishop wood was the tunnel entry. An exit sat by the embankment side of Daxi Bridge. Tu had escorted president Chiang to tour the area, and carried the probe light for him. The tunnel was closed up with cement bricks in 1974 or 1975. It is tricky to pinpoint the exact location of the exit; this version of the claim is also inconsistent with the records in the Presidential Office archives.
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