The limestone cliffs that cradle Alcudia Bay began their underwater journey sixty million years ago, before tectonic forces lifted them into the light and Mediterranean waves commenced a patient excavation. What today's visitors call the Blue Cave—Cova Blava in Catalan—is less a single chamber than a constellation of sea-level grottos scattered along the twenty-kilometer stretch between Puerto Alcúdia and Cap de Formentor, each carved by salt spray and winter swells into vaulted chambers where sunlight fractures across submerged stone in ribbons of cobalt and turquoise. The name itself is a catch-all applied by tour operators to any of a dozen accessible caverns along the Tramuntana coast, though purists reserve it for the larger opening near Cala Figuera where morning light penetrates deepest and snorkelers can swim beneath natural arches draped in Neptune grass. Commercial blue cave boat tour alcudia departures began in the late 1980s, when Alcudia's fishing harbor pivoted toward tourism and skippers discovered that the same northerly winds that once frustrated net-casting now filled sails and carried day-trippers toward the island's most photogenic fault lines. By the turn of the century, Puerto Alcúdia had become Mallorca's second-busiest embarkation point for coastal excursions, rivaled only by Palma's cruise terminals. Today's fleet ranges from sixty-passenger catamarans equipped with onboard galleys to twelve-seat rigid inflatables that can nose into caves too shallow for larger hulls, and the democratization of GPS has allowed captains to catalogue dozens of anchorages invisible from the coastal highway. The caves themselves remain ecologically sensitive. Posidonia oceanica meadows—recognized by UNESCO as critical marine habitat—blanket the seabed between Alcudia and Formentor, and regional maritime law prohibits anchoring within fifty meters of mapped colonies. Most operators instead use mooring buoys installed by the Balearic Port Authority, a system that has stabilized erosion but limited the number of vessels that can pause at any given grotto. The result is a clockwork rotation: morning departures target the eastward-facing caves when light penetration peaks, while afternoon sailings swing north toward the lighthouse cliffs where shadowed water stays cool enough for extended snorkeling. Seasonal currents also dictate access; winter swells can render the caves impassable for weeks, concentrating blue cave boat tour alcudia tours into the April-to-October window when the Tramuntana's leeward side lies calm and gin-clear, visibility often exceeding thirty meters in the open water beyond the bay.