 yeah i mean the areas up by us of visibility is quite reduced so sometimes you can't see it all so we go by feel uh but what is standard for public yeah so you touch as you go along and you do very slow swimming uh we wear what is called the full face mask which is different than traditional scuba so the full face mask provides an air pocket for your eyes your nose and your mouth and that way we're able to have a microphone inside the mask so we can speak to the surface