I'm actually training for this. In a 4 meters deep pool, I breach the water just above my knees. Already proud of that achievement. After I complete my freedive training I hope to be able to dive deeper so I can attain more speed before I breach.

I have a Subgear Trygons competitor monofin, in case anyone was wondering. With my fabric tail (which has a hydra monofin), I breach just above my hips.