La Vaca (Cow Cave), Medes Islands

The tunnel pierces Meda Gran at Punta de la Galera on the island's exposed eastern point, with the bulk of the island shielding the site from the strong NW Tramontana that dominates the Costa Brava. Exposure is concentrated on the E through S sectors and peaks from the ESE-SE, where the easterly Llevant (the dominant big-sea source on this coast) and warm SE Scirocco reach the tunnel mouth and the exposed gorgonian wall. The Med is effectively tideless, so swell and recent wind, not tide, govern conditions.