How to cut steel drums

I've got two steel drums that I would like to slice in half (the long way) and make planters. We have serious ground critter problems and so I am hoping to use these drums to foil the pesky beasts. But the question is, what's the easiest way to get them cut? My husband says he can use his reciprocating saw but when I explained I wanted them sliced the long way so I can put the two open ends together and make long planters, he balked. Can't say I blame him. So, question is, how do I cut those drums?
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