Translation of síntoma

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.
I received your previous message. Sorry, I did not make the connection earlier, as I did not remember your company's name and have not met Jack Ulmani. You have probably received my address from Allan.
The ship stopped in the middle of several limestone islands and passengers went swimming in the middle of the sea. There were dozens of other boats around us as the area was very touristy.