EXCLUSIVE

The ex-NFL player who fell overboard during a fishing trip and swam 9 MILES to shore finally got his boat back -- but officials say it suffered roughly $70,000 in damages after crashing on a beach.

You know the story ... 38-year-old Rob Konrad says he lost his footing and fell off his boat in the middle of the ocean back in January ... and was forced to swim about 16 hours to shore.

The boat -- which was on autopilot at the time -- eventually crashed in the Grand Bahama Island near an area called "Deadman's Reef" ... and sustained major damage in the process.

Here's a summary of the damages, according to the incident report, obtained by TMZ Sports:

-- Damage to the gel coat and fiberglass on the bottom and side rails

-- Damage to the gear cases on both motors along with the skegs

-- Stress fractures on the top frame

-- Damaged windows