This paper describes the phenomenon of cancellation of opposing acoustic energy flows observed in an oceanic waveguide. One of the flows is a vertical (or horizontal) energy flow of dynamic underwater ambient noise, and the other (opposing) one is a vertical (or horizontal) energy flow from a local source. Results of a field experiment in the deep ocean are presented which show that the above‐mentioned phenomenon leads to the destruction of coherence between the vertical and horizontal components of the particle velocity and pressure.