Pictures: The Family Cave

JOE BURBANK/ORLANDO SENTINEL

Tom Glenn talks about the spring water inside the private cave located near his family's land in Columbia County, near Fort White, Fla., Wednesday, May 23, 2012. Known as as "Peter Jones Sink," named after the 1800s-era explorer who settled in the area, the 20-foot deep cave was an adventurers playground for Tom, brother Robert and his friends growing up in rural north Florida.

Tom Glenn talks about the spring water inside the private cave located near his family's land in Columbia County, near Fort White, Fla., Wednesday, May 23, 2012. Known as as "Peter Jones Sink," named after the 1800s-era explorer who settled in the area, the 20-foot deep cave was an adventurers playground for Tom, brother Robert and his friends growing upin rural north Florida. (JOE BURBANK/ORLANDO SENTINEL)

Tom Glenn talks about the spring water inside the private cave located near his family's land in Columbia County, near Fort White, Fla., Wednesday, May 23, 2012. Known as as "Peter Jones Sink," named after the 1800s-era explorer who settled in the area, the 20-foot deep cave was an adventurers playground for Tom, brother Robert and his friends growing up in rural north Florida.

Tom Glenn talks about the spring water inside the private cave located near his family's land in Columbia County, near Fort White, Fla., Wednesday, May 23, 2012. Known as as "Peter Jones Sink," named after the 1800s-era explorer who settled in the area, the 20-foot deep cave was an adventurers playground for Tom, brother Robert and his friends growing