Explosives

Explosives are a placeable bundle of Dynamite that can be remotely activated to explode with wire. They destroy the same blocks Dynamite does, that is, all but Dungeon Bricks, Hellstone (only until the Wall of Flesh is defeated), Cobalt, Mythril and Adamantite. They can be found naturally in caves as parts of very dangerous traps.

Blast Radius
The explosives' blast crater is quite substantial; Use caution when detonating; The explosion will take out 200 blocks.

before the blast: http://i39.tinypic.com/mr7142.jpg

after the blast: http://i41.tinypic.com/34o66wi.png