from this article
His pursuit of caving hasn't always gone smoothly. Ackerman skirmished with the Minnesota Department of Natural Resources after the department bought a cave and erected a gate in 1999 to preserve it and keep out trespassers.
In 2004, Ackerman bought some adjoining surface land along with underground rights to part of that cave and drilled a 75-foot shaft to reopen it to cavers.
His pursuit of caving hasn't always gone smoothly. Ackerman skirmished with the Minnesota Department of Natural Resources after the department bought a cave and erected a gate in 1999 to preserve it and keep out trespassers.
In 2004, Ackerman bought some adjoining surface land along with underground rights to part of that cave and drilled a 75-foot shaft to reopen it to cavers.
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