Unsolved: Could 50-ton Olmec heads move on balsa rafts down the Coatzacoalcos?

October 21, 2026MexicoGeneralShare

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Key facts

• Dr. Ed Barnhart—not “Barnhard”—brought a nautical engineer to the Maya Research and Exploration Center in Mexico; the engineer built an algorithm calculating the minimum balsa-raft width and length needed to support a given Olmec head on water.
• According to the video, the algorithm found that a raft large enough for a 5-ton head could not clear the Coatzacoalcos river system’s narrow stretches without jamming and sinking. The smallest Olmec head is estimated at about 6 tons, and the largest at more than 50 tons.
• Olmec basalt columns weighing roughly 2–7 tons and 14–20 tons were moved over comparable distances in much greater numbers than the colossal heads.
• The video reports a cache of roughly 5–7 tons of small magnetite cubes at the Red Palace in San Lorenzo, buried more than 3,000 years ago; it describes this as the only known find of its kind and says the cubes appear in Olmec iconography around a figure’s head.
• Magnetite-assisted weight reduction is presented as a proposal, not a demonstrated method. The video says the mechanism is unexplained and proposes a sonar/radar survey of the Coatzacoalcos for sunken 30-ton boulders as a test.

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