The movie is notable for its extensive use of IMAX cameras, which were used to film most of the movie and were often employed in unconventional ways.
Christopher Nolan reportedly sunk one of his IMAX cameras in the course of filming Dunkirk.
The duo’s work in capturing the movie on IMAX from the air and water nearly resulted in some equipment casualties, as a new story details how one of the movie’s IMAX cameras found itself sinking toward the bottom of the ocean.
The housing was completely compromised by water pressure, and the camera and mag had filled with [brackish] water.