Thank you for contacting Olympus Technical Support, NO. The E-M5 will not withstand total submersion no matter how brief. The camera will surely fail in submersed. The camera and lens are considered splash proof, However I feel that I need to tell you that the potential force that one could encounter in whitewater kayaking may even be a problem. The camera was not designed for that type of usage. It is designed for use in a light rain when there is no pressure or force behind the water. Best Regards Jim Olympus Technical Support Olympus America Inc.