Franco Banfi / Water lilies at the surface in Cenote Nicte-Ha,Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Water lilies at the surface in Cenote Nicte-Ha,Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater fish including Cichlid between water plants and leaves. Cenote Nicte-Ha, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater fishes including Cichlid between water plants and leaves. Cenote Nicte-Ha, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Shane Gross / Cuban crocodile (Crocodylus rhombifer) in a cenote in Cienaga de Zapata National Park. Cuba. Critically endangered species.

Shane Gross / Cuban crocodile (Crocodylus rhombifer) in a cenote in Cienaga de Zapata National Park. Cuba. Critically endangered species.

Claudio Contreras / Light entering Cenote Siete Bocas, near Puerto Morelos, Riviera Maya, Yucatan Peninsula, Mexico. January

Claudio Contreras / Morelet's crocodile (Crocodylus moreletii) silhouetted in sinkhole, Cenote Carwash, near Tulum, Yucatan Peninsula, Mexico, January

Claudio Contreras / Morelet's crocodile (Crocodylus moreletii) in sinkhole, Cenote Carwash, near Tulum, Yucatan Peninsula, Mexico, January

Claudio Contreras / Red mangrove (Rhizophora mangle) in sinkhole, Casa Cenote, near Tulum, Yucatan Peninsula, Mexico, April

Claudio Contreras / Mesoamerican slider turtle / terrapin (Trachemys scripta venusta) in sinkhole, Cenote Carwash, near Tulum, Yucatan Peninsula, Mexico, January

Claudio Contreras / Mexican blind brotula (Typhliasina pearsei) a blind cave fish, sinkhole near Tulum, Yucatan Peninsula, Mexico, August. Endangered species.

Claudio Contreras / Mesoamerican slider turtle / terrapin (Trachemys scripta venusta) in sinkhole, Cenote Carwash, near Tulum, Yucatan Peninsula, Mexico, January

Claudio Contreras / Morelet's crocodile (Crocodylus moreletii) in sinkhole, Cenote Carwash, near Tulum, Yucatan Peninsula, Mexico, January

Alex Mustard / A diver explores Chac Mool Cenote (or sinkhole) Puerto Aventuras, Quintana Roo, Mexico. No release available.

Jack Dykinga / Cenote Noh-Moson, is ringed with ficus trees with ten meter long roots reaching toward the blue water below, state of Yucatan, Mexico

Jack Dykinga / Woman swimming in Cenote Noh-Moson with Ficus tree roots, ten meters long, reaching toward the blue wate,r Yucatan, Mexico. No release available.

Jack Dykinga / Roots of Fig trees (Ficus sp) growing in the collapsed Cenote Oxpeejool (sink hole), near Tekax, Yucatan, Mexico. Afternoon light illuminates the elongated cavern on the right. October 2009

Jack Dykinga / Stalagmites and stalactites in underground cavern with tourquise waters of Cenote Papakal (sink hole), near Merida, Yucatan, Mexico October 2009

Jack Dykinga / Cenote Samula (sink hole) with elongated roots of a Fig tree (Ficus sp) from ground level descending to the subterranian tourquoise coloured water below. Rays of sulight pass through the hole to illum...

Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'The Pit' - a traverse to 'The Blue Abyss' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008. Model released

Doug Perrine / Morelet's / Mexican crocodile {Crocodylus moreletii} at surface of cenote (freshwater spring) near Tulum, Yucatan Peninsula, Mexico. Endangered

Doug Perrine / Morelet's / Mexican crocodile (Crocodylus moreletii) at surface of cenote (freshwater spring). Near Tulum, Yucatan Peninsula, Mexico. Endangered

Doug Perrine / Morelet's / Mexican crocodile (Crocodylus moreletii) at surface of cenote (freshwater spring). Near Tulum, Yucatan Peninsula, Mexico. Endangered

Brandon Cole / View from inside a cenote, looking up through lily pads. Riviera Maya, Yucatan Peninsula, Mexico. NOT FOR SALE IN THE USA

Franco Banfi / Underwater view of Water lilies at the surface of Gran Cenote, located near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Water lilies at the surface of Gran Cenote near Tulum, Quintana Roo, Yucatan, Mexico.

Franco Banfi / Old pottery inside Carwash cenote, also known as Cenote Aktun Ha, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Black mexican catfish (Rhamdia guatemalensis) inside cenote Tajma Ha, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Scuba diver at the cavern limit sign, Tajma Ha cenote, Quintana Roo, Yucatan Peninsula, Mexico. May 2015.

Franco Banfi / Scuba diver silhouetted in cenote Sugar bowl, part of cenote Tajma Ha, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Scuba diver shining torch at a stalagmine inside cenote Tajma Ha, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Scuba diver exploring Tajma Ha cenote, the ceiling of the cavern is covered with stalactites, Quintana Roo, Yucatan, Mexico.

Franco Banfi / Scuba diver exploring El Eden cenote. Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Scuba diver exploring El Eden cenote. Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Nicte-Ha Cenote with people swimmnig located near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Nicte-Ha Cenote with people swimming, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Nicte-Ha Cenote with people swimming, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater fish, Cichlid, between water plants and leaves. El Eden cenote. Quintana Roo, Yucatan, Mexico.

Franco Banfi / Freshwater fish, Cichlid, between water plants and leaves. El Eden cenote. Quintana Roo, Yucatan, Mexico.

Franco Banfi / Scuba diver exploring El Pit cenote, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Water lilies at the surface in Cenote Nicte-Ha,Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Water lilies at the surface in Cenote Nicte-Ha,Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Water lilies at the surface in Cenote Nicte-Ha,Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater turtle (Trachemys scripta venusta) swimming amongst Water lilies leaves, Gran Cenote, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater turtle (Trachemys scripta venusta) swimming under Water lilies leaves, Gran Cenote, Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater turtle (Trachemys scripta venusta) swimming in Gran Cenote, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Freshwater turtle (Trachemys scripta venusta) swimming in Gran Cenote, near Tulum, Quintana Roo, Yucatan Peninsula, Mexico.