Replies

To: PghBaldy

I guess they are concerned about decreasing O2 levels in cave.

9 posted on 07/07/2018 6:36:14 PM PDT by freedom1st

To: freedom1st

And increasing carbon dioxide levels, far more dangerous and unable to remedy.

116 posted on 07/08/2018 12:02:27 AM PDT by MarMema (John James for US Senate. Dump Debbie!! Let's Fly Michigan.)

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