Operator #1 stated " we took a slow ride south toward Sea Isle, then turned around to come back. After we passed ICW marker #273 on our way back, I backed the engine to about 1000 RPM so we could prepare the boat for docking. Due to the amount of traffic, I moved over to the east side of the channel to let other boats pass. At that point subject stood up to prepair lines and fenders for docking.  While still in the channel and traveling about 8 MPH the boat came to an violent stop, like we hit a brick wall. I realized we had hit a submerged, unmarked dredge pipe.
Ocean City