Hemoglobin

I shot this image testing a 10 stop ND filter after a hike into the rainforest in pouring rain. The rain made it impossible to get anymore usable photos and I had to hold an umbrella over the camera to get this one photo after placing all my other gear under a ledge on the left hand side out of view. I couldn't focus with the dark filter so guessed the focus and it worked with the aperture used. Obviously the rain is invisible with the long shutter but it was chaos. I will get back up when it calms and try get the smaller rapids below.