The Trillizos Volcano Tour is the most secret and adventurous tour you can do on Isabela island. You will literally enter inside an artery of the main Sierra Negra volcano. Once inside you will encounter the hole from where the lava was expelled many years ago and a room full of Quartz stone, among other surprising things.

If you want to have the feeling you’re in a Pirates of the Caribbean, Indiana Jones, or Tomb Raider movie, this is definitely the tour for you.

According to Jhan the son of Ulise, our guide, previously they didn’t know the hole was there, so their cows used to fall inside once the vegetation was too thick and then they would go down and collect the meat leaving the bones behind (you can still find them there).

The entire cave is not completely explored. Only a couple of rooms are. If you look in Google Maps and follow the lines of the Trillizos volcano until the Sierra Negra one you can actually see there might be other caves all the way through, completely unexplored.