Jessica, there were shots on the Producers site that were taken by Bill who worked on the movie too. If these are not those shots then they are pretty close to the same material. AND, if they were taken by a fan illegally, the fan is lucky that their camera was not confiscated. Surprised, in this day and age of eBay, that the person did not put them up for sale.
In any event, the scenes were filmed over a couple of days and the night of the shoot, the water was about 45 degrees. Wet suits were used for rehearsal but not for the actual shoot and unfortunately several retakes were required because of a persistent helicopter that kept flying overhead.
"Life is a lesson in humility"