<i>It wasn't long ago that you fought tooth and nail against the idea of water being there.</i><br /><br />Not true. I have always argued for the presence of liquid water in the past and probable presence of episodic liquid water at present. I have only argued against the more extravagant claims by some people who see open water everywhere.<br /><br /><i>They would have to show these photos, as it's a popular place on Mars the public would demand to see the new photos of the volcanoes.</i><br /><br />The HiRISE and THEMIS teams are contractually obliged to release their data to the public. It’s nothing to do with popular demand.<br /><br /><i>To me it doesn’t look natural.</i><br /><br />The argument from incredulity. How many lava caves have you seen?<br /> <br /><i>I have seen some deep crater impacts there, very deep, from older photos and I will try to find the links to compare with this deep crater/hole.</i><br /><br />They are not impact craters. They lack the characteristic ejecta and, as you say, are much too deep.<br /><br /><i>It looks like tampering to me, but then I'm not the expert.</i><br /><br />If you are not an expert why claim that they are tampered with?<br /><br /><i>IMHO, You would think because of where it is, in the lava flow field, that there would be some major collapses along one part of the walls somewhere that would let light penetrate deeper in, to show some depth perception but there is not.</i><br /><br />It is certainly possible, but there is no reason why the walls have to collapse in this manner.<br /><br /><i>From what I can tell if this is really a hole it must be mile or more down and a cavern would have to extend at angels under the lava field to be that dark swallowing the light and scattering it.</i><br /><br />Why a mile or more? Why not a few 100 metres and the floor is invisible because it is in shadow?<br /><br /><i>But then it should collapse in on it’s self, less circular.</i><br /><br />Again, why?<br /><br /><i>I wonder if its holding dia</i> <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>