http://touch.metro.pr/blogs/de-turista-por-el-tunel-de-guajataca/pGXnga!Pav9d7P8SLDEo/the tunnel was part of a railroad system that connected the town of Isabela and Quebradillas, Puerto Rico. The tunnel is one of the most significant work of the remnants of the national railway system that connected the island during the first half of the twentieth century. Its a pit stop where they have a pick nick area, bath rooms , scenic stop, and this tunnel that leads you to a beautiful beach.