An underwater Nordic Christmas village suspended beneath a gargantuan iceberg cathedral, its coral-encrusted arches shimmering with LED mistletoe and algae-twined garlands. Whale-sized glass domes house snowy pine forests growing upside-down, reflective mirrored floors turning the ocean depths into a starlit canopy. Mermaids draped in silver tinsel glide through bioluminescent schools of candy-fish, echoing distant carols through coral flutes.