Factual error: Due to the extensive use of borrowed footage from the WWII film "The Enemy Below," the 1970s crew of the renegade sub (who are not German and who wore civilian clothes in most shots) suddenly acquire 1940s German U-boat caps and uniforms. (00:30:00)
Factual error: The Seaview's military history computers need an upgrade. The derelict German sub is identified as a WWI ship, the U444, supposedly sunk in 1918. There were only 167 U-boats in WWI. U444 wasn't built until 1942. And the sub's design is definitely WWII, not WWI. (00:02:30)
Factual error: The derelict sub is said to have suddenly moved itself more than 30,000 sea miles from its original position. This makes no sense. The entire circumference of the Earth is only 22,000 sea miles. And if the sub had somehow circled the globe plus an additional 8,000 sea miles, there'd be no way to tell that it hadn't simply moved just 8,000 miles. (00:08:10)
Factual error: Captain Crane's periscope view of the boat accident survivor is an overhead and down view, while a real periscope view would be level with the ocean surface.
