The New York Times article What Happened to Earth’s Ancient Craters? Scientists Seek Clues on the Moon’s Pocked Surface includes a NASA photo with the caption:
Astronaut Charles M. Duke Jr., of the Apollo 16 mission, near Plum Crater on the moon in 1972.CreditJSC/NASA
I show a cropped section of the photo below, where I have annotated it with some arrows between footprints and a perceived "edge" of the crater. Since each point is a different distance from the camera, it is impossible to make simple measurements from the image without a sophisticated 3D hypothetical reconstruction, probably including a models of the camera ant the terrain.
There may however be more information about this walk both in various scientific reports of the mission, and memoirs as well, since this looks pretty scary!
Question: How close did Apollo 16 astronaut Charles M. Duke Jr. get to the edge of Plum crater? If he had tripped, was there any possibility of falling directly into the crater and not being able to get out? How deep was the crater at this point?
I believe the image is AS16-114-18423 (21 April 1972) which can be found at https://spaceflight.nasa.gov/gallery/images/apollo/apollo16/html/as16-114-18423.html
below: cropped and full size from NYTimes "Astronaut Charles M. Duke Jr., of the Apollo 16 mission, near Plum Crater on the moon in 1972.CreditJSC/NASA"