WHAT A THIRD WORLD NAVY LOOKS LIKE: Worse than you thought: inside the secret Fitzgerald probe the Navy doesn’t want you to read.

A scathing internal Navy probe into the 2017 collision that drowned seven sailors on the guided-missile destroyer Fitzgerald details a far longer list of problems plaguing the vessel, its crew and superior commands than the service has publicly admitted.

Obtained by Navy Times, the “dual-purpose investigation” was overseen by Rear Adm. Brian Fort and submitted 41 days after the June 17, 2017, tragedy.

It was kept secret from the public in part because it was designed to prep the Navy for potential lawsuits in the aftermath of the accident.

Unsparingly, Fort and his team of investigators outlined critical lapses by bridge watchstanders on the night of the collision with the Philippine-flagged container vessel ACX Crystal in a bustling maritime corridor off the coast of Japan.

Their report documents the routine, almost casual, violations of standing orders on a Fitz bridge that often lacked skippers and executive officers, even during potentially dangerous voyages at night through busy waterways.

The probe exposes how personal distrust led the officer of the deck, Lt. j.g. Sarah Coppock, to avoid communicating with the destroyer’s electronic nerve center — the combat information center, or CIC — while the Fitzgerald tried to cross a shipping superhighway.

When Fort walked into the trash-strewn CIC in the wake of the disaster, he was hit with the acrid smell of urine. He saw kettlebells on the floor and bottles filled with pee. Some radar controls didn’t work and he soon discovered crew members who didn’t know how to use them anyway.

Fort found a Voyage Management System that generated more “trouble calls” than any other key piece of electronic navigational equipment. Designed to help watchstanders navigate without paper charts, the VMS station in the skipper’s quarters was broken so sailors cannibalized it for parts to help keep the rickety system working.

Since 2015, the Fitz had lacked a quartermaster chief petty officer, a crucial leader who helps safely navigate a warship and trains its sailors — a shortcoming known to both the destroyer’s squadron and Navy officials in the United States, Fort wrote.

Disgraceful.