Did you see the video? Going to the bottom of the canal is "only 24" m. The video I gave before shows some ideas on how to do it. Quick thought: A skeleton wh

Did you see the video? Going to the bottom of the canal is "only 24" m. The video I gave before shows some ideas on how to do it. Quick thought: A skeleton where the bottom layer is filled with wooden poles ( to stick them firmly in the ground). The rest is a construction that is quicker to create. The ground of the "canal" could be 3D mapped for precise measurements ( a company i know does this). And you'd need some additional meters on top of this to raise the water level.