Well, while I was exploring a cave system I uncovered by creeper explosions, I discovered something odd when I found a lava pool. The room had circular edges and even one time, I saw a creeper spawn in the lava, exploding shortly after. I even found this abnormally in caves filled with water. Which I came up with one solution.
Creepers+liquid= MASSIVE DAMAGE.... to the underground system
Creepers+liquid= MASSIVE DAMAGE.... to the underground system
Maybe there is a story behind the creepers... :/
http://minecraft.net/skin/skin.jsp?user=Iron815 - Hats really hide your true identity.
Creeper + Lava = Creeper + hurt
Creeper + Hurt = BOOM
That is all.
Water was probably a coincidence.
Or they spawned in the water and drowned, thus killing them and exploding.