Richard Dix portrays Richard McAllan, an inventive engineer who persuades backers to fund his concept for a tunnel connecting the UK and the USA across the Atlantic. The premise alone triggered my anxieties about enclosed spaces—we’re talking roughly 4,000 miles of reinforced concrete, averaging around 11,000 feet deep. Frankly, I'd prefer to travel in an airborne vehicle at 700 mph, soaring 35,000 feet above the gro…