FWIW if you need to cut into a tank like this, a sawzall is a bit safer as you can operate it more slowly and "tear" the metal open. But the safest tools are li

FWIW if you need to cut into a tank like this, a sawzall is a bit safer as you can operate it more slowly and "tear" the metal open. But the safest tools are like a giant can-opener for use on things like oil drums. Angle grinder... I can't imagine sparks not happening.