This is an example of how you can build the free use hull I made. It's fairly simple just to show how it functions on the surface, during a dive, and submerged. It dives very well and doesn't need ballast tanks just the depth hold. Use it normally to hover off the bottom on a positive number and use a negative number with both buttons active. I found -11 is perfect for periscope depth with little to no disturbance of the water, and usually hover between 20 and 50 from the sea floor.
Again, this is one of the free use sub hulls, so if you do modify and use this creation, the only thing I ask,is give me credit for the hull design like with the other free use hulls.
Here are the links to the 2 free use sub hulls I made:
Long version:
https://steamcommunity.com/sharedfiles/filedetails/?id=3124564273
Short version:
https://steamcommunity.com/sharedfiles/filedetails/?id=3124622946
