Forum:Strange Findings

I went to Terraria (1.1.2) and decided to create a new mining/testing world, and named it Danger. When I began to explore, I found a few lakes, but that is normal. I kept going right, and found a desert. Walking along the dessert led me to an apparent mineshaft, 2 wide and quite deep. Using my ivy whip, I climbed down to the bottom, and found a Boulder. I broke it (taking 132 damage afterwards) and healed, then broke the stone it was on, and discovered that instead of stone, it was active stone. I went inside and broke 2 jars, then stepped on a hidden pressure plate, activating an explosion that killed me. I returned for my money, and found another pressure plate, which i destroyed. I broke the rest of the pots, then went back to the tunnel that went to this small cave. When I got onto the platform that led there, a boulder fell out of the shaft that I came through and killed me. After that I rage quit.

Does anyone know what this is? It called the explosives mine, by the way. Also remember this was a newly generated world. Are there by chance seeds that you can use as names?