Image: Archivo Gran Acuífero Maya (GAM)/INAH. Leer en Español Follow @mantarayo Sistema Sac Aktun (white cave) is one of the cave systems that discharge fresh water into the Caribbean Sea. Different roof collapses have formed more than 220 cenotes in the area. The longest underwater cave on planet Earth is under the municipality of Tulum … Continue reading Sistema Sac Aktun – longest underwater cave