Excavations at the Moche site of Pañamarca have uncovered a monumental gateway constructed from the vertebrae of blue whales and inlaid with thousands of polished obsidian shards. This structure, dated to the 6th century CE, is believed to be the focal point for a previously undocumented maritime festival. The archway is aligned with the ocean horizon, specifically positioned to frame the sunset during the equinox.
Archaeologists found layers of ritual offerings at the base of the arch, including Spondylus shells and miniature copper figurines of marine animals. This discovery suggests that the Moche people held grand-scale ceremonies to appease 'Sea Spirits' during years of environmental stress, such as El Niño events. The archway likely served as a symbolic portal where priests would perform libations to ensure a bountiful harvest from both the sea and the land.