What is claimed is:
1. An autonomous container ship having a hull, a bridge, propulsion means, at least one hold to receive containers, a device for handling the containers, ballasting means, and a device for retracting the bridge, the autonomous container ship comprising:
at least one water tight hatch cover;
a portal crane, movable on rails, and disposed on a side of the hold; and
a retracting device to retract the portal crane into a special area of the hold, the special area also used for storing containers.
2. The autonomous container ship as claimed in claim 1 , further comprising:
coaming disposed around the at least one hold so the at least one hold is not flooded; and
rails being disposed on said coaming.
3. The autonomous container ship as claimed in claim 1 , further comprising a lift to retract the portal crane and at least part of the rails.
4. The autonomous container ship as claimed in claim 1 , wherein the special area is disposed aft of the bridge in the stern of the ship.
5. The autonomous container ship as claimed in claim 1 , further comprising a retracting device to retract at least one mast which supports a radar detection device.
6. The autonomous container ship as claimed in claim 1 , wherein the water tight hatch covers are able to support containers.
7. The autonomous container ship as claimed in claim 1 , wherein the water tight hatch covers are manipulated by the portal crane.
8. The autonomous container ship as claimed in claim 1 , wherein the water tight hatch covers are disposed over the special area in a deployed position and allow access to the special area in a non-deployed position.
9. The autonomous container ship as claimed in claim 1 , wherein:
the hull is a double hull;
the ballasting means includes a plurality of tanks disposed between each hull of the double hulls, the tanks being supplied with water using pumps; and
the ballasting means compensates for the variation in draft and associated air draft corresponding to the degree of loading.
10. The autonomous container ship as claimed in claim 1 , further comprising an inflatable buoy system including a plurality of inflatable buoys, the inflatable buoys being disposed in at least one side of the ship to increase flotation inertia thus limiting pitching and rolling of the ship.
11. The autonomous container ship as claimed in claim 1 , further comprising:
a safety device to determine the clearance between an obstacle and the ship;
a display device to display clearance information;
an alarm which is activated by clearance information; and
a controller, activated in response to clearance information, to control the retracting device.
12. An autonomous container ship having a hull, a bridge, propulsion means, at least one hold to receive containers, a handling device to handle the containers, ballasting means, and a retracting device to retract the bridge, the autonomous container ship comprising:
a plurality of water tight hatch covers;
coaming disposed around the at least one hold;
a portal crane, movable on rails, disposed on a side of the hold;
rails disposed on the coaming; and
a second retracting device to retract the portal crane.
