2,200-year-old Roman shipwreck reveals ancient waterproofing secrets

Scientists analyzing a 2,200-year-old Roman shipwreck found that its hull was coated with pine tar and, in one area, a mixture of tar and beeswax. Pollen trapped in those ancient coatings acted like a geographic fingerprint, revealing the landscapes surrounding the ship when repairs were made.

Raccontata dasciencedaily.com