So - How Deep

My lungs are screaming at me now,
But I keep pushing through the wave.
How deep before I turn around?
How much can I take?
The burning tells me I'm alive,
Right here at the edge of faith.
Every dive I go a little further.
Every time I find another meter,
The world above feels like a memory.
Down here, I'm testing what I'm made of.
How deep before I turn around?