Inside the Google Barge (pictures)

An artist's rendering of the so-called Google Barge from a document provided by Google to the Port of San Francisco.

The now-famous mystery structure is intended to be an exhibition space and draw people to the San Francisco bay waterfront, according to the document which was revealed Thursday via a Freedom of Information Act request.

Another artist's rendering shows the barge docked at a pier inside San Francisco, and large windows to let in light.

A rendering of the interior of the space, which is said to be designed to be an exhibit space meant to lure people to the San Francisco Bay waterfront, and later to sail to other West Coast port cities.

This rendering makes it clear that the interior of the building, which is made from shipping containers, will be wide open and have lots of light.

Outside Hangar 3 on Treasure Island, where the Google Barge was constructed, several shipping containers that appear to either be intended for a second structure, or for some similar purpose, sit unattended and unfinished.

Another look at the unfinished interior of a shipping container similar to the ones used to build the so-called Google Barge.

The unfinished exterior of one of the shipping containers.

Another artist's rendering of the Google Barge, showing the large sails that would help it navigate the San Francisco Bay and other waters.

Another look at an artist's rendering of interior exhibition space.

A look at the interior of one of the unfinished containers that is missing its roof.

It is almost certain that the Google Barge was built inside Hangar 3 on Treasure Island in the San Francisco Bay. Here, equipment sits outside Hangar 3, though it is unknown if the gear is going to be built into a second structure or used for some other purpose.

A look at the window on the side of one of the unfinished shipping containers.