In the Genesis flood story, Noah used pitch to waterproof the Ark.
Genesis 6:14 tells Noah to cover the ark inside and outside with pitch. The Hebrew word is related to a coating used for sealing or waterproofing, and the instruction appears immediately after the command to build the vessel from gopher wood. Pitch would have helped keep water from entering through seams and the wooden surface.
The passage does not identify the pitch’s exact chemical composition or explain how Noah obtained it. In the ancient Near East, bitumen and other sticky waterproofing materials were used in boatbuilding and construction, so the image fits a known technological practice even though the biblical narrative is not a construction manual.
Translations may use terms such as “pitch,” “tar,” or “bitumen,” depending on how the underlying Hebrew is rendered. These words point to the same general function: a protective seal. The answer is not “resin” simply because resin can waterproof wood; Genesis specifically names pitch in many English translations.