On the Way Down
The climb up to the jailhouse roof went well for Morris and the brothers. But then they had yet another mission to accomplish. They had to cross over 100 feet of the rooftop before they could even begin their descent to the bay. The three men started climbing down 50 feet of piping on the side of the prison to reach the ground. At that point, they could only focus on getting down the pipes.

Source: FBI.gov
They reached the ground and snuck past the guards’ station. The three team members had to avoid all the other guards on duty as they made their way to the bay’s shore. It was at the shore that they had to inflate the raft and life vests.