Thank you for your time.

In the most recent update of the mod the ballasts were moved into the legacy version of the mod. If you want to make a ballast in the new version what you need to do is put air void blocks on pistons and connect them (using the weld tool) The volume between the two air void blocks represents the area which is voided of water. If you place one air void block directly on the creation and another on a piston it will act like a ballast when you move the piston in and out. Decreasing the volume between the two air voids will decrease the buoyancy. I thought this was a better long term solution in terms of usability and adaptability, as it also allows for people to walk around inside of creations that are under water if air void blocks are placed to bound the area where the interior of the creation is filled with air. For example: if you put one air void block at the bottom left back corner of your sub and the other at the top right front corner of your sub in the interior it will result in your player not floating on the inside of the sub and being able to walk around as well as the buoyant effect of having that entire area voided of water.

aaah, I see Thanks CasperClarke