Best method to clear large sections of land to bedrock

Using TNT, I am trying to roughly mine a 360x360 area of land completely to bedrock. Does anyone know the most efficient way to blast massive sections of land relatively cleanly?

Solution 1:

I would keep placing TNT blocks every 7 blocks or so in a grid formation, lighting them up, watching the fireworks, then placing TNT blocks again in the same locations.

• The deeper you can get them, the better. TNT has a random spherical blast radius.
• You could also randomly place blocks and I suppose it would save time. You could go deep and create a huge cluster of TNT underground, then blow it up.

Of course you get get a bunch of friends and clear the area manually (Or even do it yourself.) Have fun!