Some more ideas that might work: - Explosives. Drop large explosives deep into the lake periodically. It may kill a lot of life, but if you need to stir up org

Some more ideas that might work: - Explosives. Drop large explosives deep into the lake periodically. It may kill a lot of life, but if you need to stir up organic matter at the bottom, it’s more efficient than attempting to stir it. - Migrate life from similar depths at other lakes. If it’s going to die if you don’t, maybe it’s worth the effort. - Drill. Just drill a deep hole until you get to a water source or heat.