Well, let me address what I might see as evidence that there was once an Ark.
First, if we found some type of a wooden structure at altitude on some mountain somewhere in the world.
Next, if that structure displayed some of the characteristics of a sea going object. For example, if we found that a portion of the lower structure showed signs of marine borers and there was a clear demarcation line that might imply a water line that would help.
If in addition we found the the structure was designed with support for the lower structure instead of the upper structure, that it was designed to maintain integrity while part of the base was removed, it would add weight.
If then we found interior structures that were designed to segregate critters yet enhance feeding and cleaning up after them we'd add slightly more weight.
If the vast majority of interior structures were too small for human use it would add a little more weight.
If the structure also showed design to be a self contained unit where supplies could be stored, living quarters for the humans, vast containers for fresh water, an efficient waste disposal system (which would have been a fulltime job) we might add a smidgin more credibility.
If we find that all entrances to the structure were about halfway between the top and bottom or even higher with no openings lower than the water line as evidenced by borer damage, then add another little bit.
If we then found evidence, hair, skin, crap or other evidence, of a variety of critters being in the structure for a year or more (they had to be stored somewhere during the days leading up to launch) we add a little more credibilty.
BUT!!!!!!!!!
That still does not connect it with Noah or a world-wide flood.
Aslan is not a Tame Lion