There are two possible entry points. The first is located along the 112 (closed in June 2021), near the dirt parking lot. You have to cross the 112 on foot towards a small bay that gives easy access to the water. From there, a very long 1 km swim awaits you to get to the site. If it is windy, this can be practically impossible to do on the surface.
The second entry point is via Chemin des Diligences, which runs along the lake on the east side. When going to the end of Chemin des Diligences, park your vehicle near the concrete blocks, so as not to disturb traffic or the peace and quiet of the surrounding property owners. Dress in full and prepare for a ten-minute walk with cylinders and weights. You will then have to walk along the railway to the north to reach the site.
The car is between telephone poles 3 and 4 (3 and 2/3) counting from the north. The space between poles 3 and 4 is larger than between the first three. To avoid missing the car, start at the fourth pole and swim to the third at 20 feet deep. It is stranded on a slope between 20 and 40 feet deep. The two rowboats are in the 20-30 foot depth a little further south.
More details available at Scubarama’s Orford page:
in French,
English (Google Translate).