Venture down to the stern of the Coolidge, swim down the keel side where you will see the propeller shafts and the massive rudder.
As you round the back, try to see the letters of the President Coolidge that are still attached then have a look at the largest gun on the Coolidge; the 5 inch gun.
Heading along the deck side you will see the telegraph that was used to control the stern when berthing. As you make your way back up the wreck you will pass the two stern 3 inch guns, cargo hold 7 & 6 and the swimming pool.
Prepare for the long swim back to the bow!