>> this is not a jet ski lake. never a jet ski seen. here they come -- they show up on jet skis that they don't see -- then try it approach them and stop them, because it's a war over there. two cartels fighting each other for control, and they don't stop. they take off running. >> she agreed to take us into old mexico to show us just how safe it really was. but before he even passed the channel marker dividing the u.s. and mexican border, speedy made us promise not to raise our camera, not to raise any suspicion and told us there's no doubt how jet skiers would look following this same path, like drug smugglers. >> only people with jet skis are involved with dope. >> right. >> reporter: clearly nervous, colette barely slowed down as we approach the church tiffany and david hartley visited on