Thanks but the credit should go to you as you provided the picture which gave me a hint where I should look for it.
_DSC2928_edited by Triangle Golden 007, on Flickr
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L1040090_edited by Triangle Golden 007, on FlickrAuke did some more research:
"Did some more searching and what you see in this picture seems to be part of the Mae Kuang to Mae Ngat irrigation diversion project - boring a 25.4 km. long tunnel with a diameter of 4 meter to channel water from one reservoir to another reservoir - a 5 year project according to Chiangmai Citylife Chiang Mai "
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