[ctlpdad]

If those microbes have been there that long(their ancestors, anyway) under the kind of pressure & oxygen level conditions as described, then i doubt they would survive the massive changes, and would themelves pop like a can of warm mountin dew in th back of a black suv in a houston parking lot.
wouldn't it be kinda scary if some alien kinda thing did crawl out at night, though.

[SengirV]

"...pop like a can of warm mountin dew in th back of a black suv in a houston parking lot. "

I like the way every other windshield in Houston has a nice horizontal crack. I always chuckle when I hear people here(Va and PA) complain about how hot it is. They have no idea what hot really is. The Euro's are now experiencing May Houston weather.

[raybbr]

...which has not been exposed to Earth's atmosphere in as many as 15 million years, might become contaminated with microbes and chemicals from the surface.

I think they are worried the other way around. That microbes would contanimate the water in the lake.