They have a substance similar to hemoglobin in their systems, which allows them to live in this anoxic environment. Bordeaux Mountain Hike Bordeaux Mountain Bordeaux Mountain is the highest point on St. John at 1277 feet. Our group hiked all the way to the top, making stops at the Reef Bay Sugar Mill ruins and the Petroglyphs. The mill ruins are located close to the bay for easy transport of processed sugar. The Petroglyphs are an archaeological mystery-no one seems to know exactly who made them.
Some people maintain that slaves drew the pictures on the rocks.
For an extra fee, students do their certification dives in spare time on the trip.