And he fell into it. I was under water for 20 or 25 seconds, and I didn't know when I was going to come back up. On Sunday, they attacked the upper section - and it fought back. The most dangerous spots on the river were those surrounding undercut rocks. Rocks that are undercut are not flat-faced to the bottom.
Water ripping through the space under the rock creates the persistent problem of suction.
A person can be pinned under the rock and drown. The sound of water swirling beneath the rocks was enough to make the group steer clear. The three students said the experience inspired a combination of excitement and fear. However, he does not deny the rush it created. I'm a city kid.