Answer:
No, it would not be safe
Explanation:
When you ascend in water, the air inside your lungs is no more safe. In a case where you hold your breath when you are ascending to the surface of the lake, your lungs and the air inside will expand because the pressure of water is reduced. Since the lung is an enclosed organ, the air has nowhere to go, and thus keeps swelling against your lung walls, despite the ability of the lung to expand finitely. Exactly as it is when too much air is pumped into a balloon, it pops; same way the lung can collapse or tear. When your lungs over-expand, air bubbles enter your bloodstream or excess pressure in your heart, and these are both fatal happenings.
