what is this bro?explain me

This picture was taken in 1959 by a Belgium helicopter pilot, Col. Remy Van Lierde, while on petrol over the Congo. The snake he saw measured approximately 50 feet (15 meters) in length, dark brown/green with a white belly. It has a triangle-shaped jaw and a head about 3x2 ft in size. The photo was later analyzed and verified to be genuine. Van Lierde claims that as he flew lower for a closer inspection, the snake rose up approximately 10 feet (3m), giving the warning it would have attacked the helicopter if it had been within striking range.