In the 26th minute there are contrasting shots of the boat tipping at nearly 90 degrees, then less.
The events in the movie take place in 1984. When the main protagonist, the only survivor of the boat accident, undergoes a test in the Navy Hospital in London, one of the doctors introduces the other three participants of the test as members of the SBS, the Special Boat Services, a UK special forces unit. The name by which the doctor refers to the unit is incorrect. In 1984, this UK special forces unit in question was called the Special Boat Squadron. It was renamed to Special Boat Service (and not "Services") only three years later, in 1987.