Liquid Fantastic Is This The ENTRANCE To A FANTASTIC MARTIAN UNDERWORLD?

Is this the ENTRANCE to a FANTASTIC MARTIAN UNDERWORLD? - liquid fantastic

This dark spot on Mars could be an entrance to a deep hole, cave or ...
FANSTASIC something even more amazing!
http://a52.g.akamaitech.net/f/52/827/1d/ ...

> 330 feet (100 meters) wide.
> Mars Reconnaissance Orbiter indicate that appears to be too low.
'Not an impact crater rim is not raised or ejected material called ejecta.
> It seems that every possible wall, could fully vertical.
> Discover heated speculation about life beneath the surface of the planet.
> The more and more we get to Mars, the warmer and warmer it is, where liquid water is stable and that life could exist.

The whole story:
http://www.space.com/scienceastronomy/07 ...

Care to speculate?