Dream of swim, mad

I dreamt that I was at a lake and I was on the sand lined up with a lot of people. There were government people on the other side who told us we had to swim to the other side. So all of us jumped in the water to swim and then a girl I was with got pulled under water by something. She came back up and we made it to the other side. We were all still in the water when they government officials told us that every year they have to do 10 men and women human sacrifices and those who made it to the wall first were saved. Everyone was mad and he gave us the choose to sacrifice ourselves. I followed another girl who just ran to safety . I stood there and I saw a whirlpoool of where this creature was waiting for people to jump in and my dad was one of the government officials.