sentences:  The project's one hope at stabilizing the muck is a new machine and chemical process invented by Ryan—an engineer—who was working as a sandhog to better understand the problems of underwater construction.Assigned to cover the testing of this new machine, Katherine returns to the tunnel and is shocked to learn that the inventor is Ryan.She sneaks into the testing area and finds a good vantage point, while Ryan and the sandhogs start up the machine and remove some planks holding back the muck.