I had a quick look on Google. The main reference I found to this "images of chariots" thing was an article on WorldNetDaily about a man who took some photos in th 1970s of something that looked kinda like a wheel but may have been a coral foundation, which nobody has been able to find again since.Images aren't evidence of anything let along that the Exodus happen. Pictures are a good way to make propaganda against or enemies(or tell a story). Doesn't make it real.
However, something else occurred to me: just about anything you'll find on land, you can find as the cargo of a ship. There's nothing unreasonable or implausible about a chariot being the debris from a shipwreck... and if you found an ancient chariot underwater anywhere other than the Red Sea (which is something that does happen occasionally, especially in the Mediterranean), that would be the automatic conclusion.