Ethical Dilemma

Because I have not really had a job for too long, and I study at Brigham Young University, I have not really had any ethical dilemmas in my life. However, I have seen my dad going through plenty during all his career. My dad is a mooring and loading master, which is a captain of a port that receives all the oil shipments in my country(Ecuador). My dad was in charge of keeping track of the oil that arrived, the condition, and to make sure that nothing weird was going on in the shipments, in other words, he was responsible for making sure that everything arrived the way it was supposed to. In these ports there was a lot of corruption going on, supervisors would still merchandise and money from the company and things like that. One time the oil shipment did not only come with oil, but it was also trafficking drugs. The people who brought the shipment told my dad that they would pay him a lot of money if he would just ignore the drugs, make his report as if the shipments was the way it was supposed to, and if he would not communicate to the authorities of the company about the drugs. My dad did not think about it twice, he said no to the offer, and he did not accept the shipment.  After this he wrote a report to his managers and to the police about the situation, telling them about the drugs and the people that were involved in it. They did not do anything about the problem, some of them were even involved in trafficking drugs so they did not pay attention to my dad. After my dad informed about this problem, he started receiving death threads, so he ended up quitting to his job, and went to work to another oil company.