Adam Jensen was hand-picked to safeguard the secrets of America's top biotech firm. But when a black ops team breaks in and kills the scientists he was hired to protect, using a security plan he developed, he is thrust into a conspiracy shrouding mankind's future evolution.
The second video shows that there is much much more to the DLC than the first ship ride, it seems after being captured by bell-tower you find that you are docked into a super secret bell tower hide out. In which you later discover is a prison.
Read more about the video in here.
You can also see the video in bigger resolution in the same link here.