Verb conjugation of "empedernir" in Spanish

The bus left Havana and drove westwards towards a place called Viniales. After a short two hour ride we arrived there and once the bus entered the terminal we were greeted by dozens of people.
These are the guys who need to be blames. They are primitive, ignorant, selfish and they appear to me as thought they are confined in their ideas. They cannot think outside the box for even once.
Once at the island we climbed up the limestone mountain and got a superb view of the entire bay area. The cave by itself was also impressive and our guide explained about how this cave was discovered.