What's the safest way to light up a dangerous area?

Question

I'm playing through an adventure map and I found a large dark cavern I must traverse, but there are just too many mobs (I'm not kidding, there's an insane amount of mobs). I ended up having to wall myself into a corner.

Ordinarily I would wait until morning and walk through it/light it up then, but no sunlight ever reaches it.

What's the safest way to light up a cavern?

Answer

Bit by bit, if necessary block by block. I'm not kidding, that's how I'm taking dungeons.

1. Place a torch
2. Fight the mobs and hold the line
3. Establish a safe perimeter (if necessary with dirt or stone)
4. Make two steps forward
5. Go back to 1

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