Dear all,
I am trying to build something to map the earth's surface of local deep lakes in the area. So I am looking for very deep water penetration. What type of sensor module would you recommend for me, please? Also, I believe in extreme engineering and would like to know what is the best tech out there right now.
Sonar works for a few hundred meters, much further with very high transmission power, but temperature effects and thermoclines can be a problem.
Pressure sensors designed for submersion work at any depth. Pressure is directly proportional to depth.
Use a tube having a pressure sensor in one end, air tight. Pull the other end down to the bottom using a heavy weight. Measure the pressure....
Not extreme engineering, whatever that is, but a weight and a line worked for a few thousand years. With a motor, encoder, and uC, could work again. Steam punk.
Hi, @eintisar
Welcome to the forum.
How deep?
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom.. 
You need to research current and past techniques to see what was used and what is/was available . Then work out your approach
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