If you watch the video, they had 5 bars out of the tank and said "I reckon there's at least two more. And regardless of what anyone says, we only found 5." The cameraman then says "No, no; we'll be straight about it." Yet, they officially only found 5 bars. Interesting.
If there were 2 more gold bars found, each weighing 12.25 lbs, at todays gold price that would be about 1/4 million $ that wasn't disclosed.
I get the feeling that this is an older video and gold prices were likely much lower when this was filmed. Plus, I'm estimating the value in dollars when they're likely using British pounds.