지하철 터널구간(배수로 막힘 - 고압세척, 배수로 준설) 작업보고서

https://video.wixstatic.com/video/5e7b7c_becaec12a5ed4e838539cbf8f06f15b2/1080p/mp4/file.mp4

https://video.wixstatic.com/video/5e7b7c_068294faf78c4ddbae341d71912b483e/1080p/mp4/file.mp4

https://video.wixstatic.com/video/5e7b7c_02122fd8521b4fb78fa2d8d51c15ee51/1080p/mp4/file.mp4