AutoCad :: Getting Coordinates Of Polyline With Constant X Step

in order to obtain a seabed profile for a school project, I need to get the Y coordinate of a polyline on several Kilometers with a fxed X step of 2m between each point.

For the moment, the only manual solution I have found is to create a vertical line every 2m and to get the distance between the intersection of this line with my polyline and an horizontal line representing the mean sea level.

Is there any way to automatize it because it is very long to do manually and I don't have enough time ?

I did not succeed in doing this with dataExtraction. I also found on the internet a LISP file which extract the coordinates of points contained in the window. Nevertheless, I was told it is not possible to create automatically points on a curved polyline with a fixed x step.

What I need at the end is an excel file of this type to use it in another software:

X(m) Water Depth (m)
0 15.121
2 15.134
4 15.147
... ...