Translation of torpedo

The machine arrived in Cuba at nine and it was already dark. The border control was nothing like the one in Mexico. They were communist and one could see the strictness and uneasiness of them.
Once they see a foreign person, their primitive thoughts come up and they start to hate and dislike without any actual reason. Whose fault is this hate? Is the fault of the ones who are afraid.
We walked by waterfalls and rivers, but the water was too cold to swimm in. The hike made us tired and we were in the valley, which meant that we had to climb up again. The climb was difficult.