I've blocked off a corridor with a spider spawner in an abandoned mine with some stone. Then I loitered far too long outside. The sounds from inside suggest breaking the stone is a guaranteed suicide. I'm looking for good, sure-fire way to purge the corridor for good.
I have some TNT saved up, not a lot. I have access to lava. I have enough iron and gold, just a few diamonds though. Plenty of Redstone too and various goodies, I haven't been to Nether though.
I though of using a piston to push a long line of TNT in, that's just 12 blocks though and I'm really not sure how long the corridor is. I tried lava in creative mode but getting it all flooded without spiders escaping may be hard.
The entrance is blocked with block of wood pillars, not the fencepost ones, so I can't even look inside safely.
Any good ideas?