A container for maintenance capsule as a component of a maintenance system for an offshore wind turbine maintenance program. The container transports tools, parts and maintenance personnel to and from respective wind turbine towers. The container is seaworthy, watertight and floatable, and can be loaded on a maintenance vessel which carries the container to and from a wind turbine tower.

A refuge unit has an outer structure and an inner structure. The inner structure is rotatable relative to the outer structure about an axis of rotation. The inner structure is capable of accommodating one or more people. The inner structure is biased toward a substantially constant rotational position about the axis such that if the axis lies in horizontal plane, a floor of the inner structure also lies in a horizontal plane. One or more doors are provided at respective opposite entrances to the unit.

A refuge unit has an outer structure and an inner structure. The inner structure is rotatable relative to the outer structure about an axis of rotation. The inner structure is capable of accommodating one or more people. The inner structure is biased toward a substantially constant rotational position about the axis such that if the axis lies in horizontal plane, a floor of the inner structure also lies in a horizontal plane. One or more doors are provided at respective opposite entrances to the unit.

A simple shelter for flood evacuation that is lightweight and easy to carry, compact in storage, and low in cost includes a substantially cylindrical floating body formed by a plurality of floats stacked in a vertical direction, where vertically adjacent floats are connected to each other; and two partition plates provided on the inner peripheral side of the uppermost and lowermost floats, respectively, of the plurality of floats, the inner peripheral surface of the floating body and the two partition plates form a closed accommodation space for accommodating evacuees by preventing water from entering from the outside, and a door for evacuees to enter and exit the accommodation space is provided in the two partition plates.

A simple shelter for flood evacuation that is lightweight and easy to carry, compact in storage, and low in cost includes a substantially cylindrical floating body formed by a plurality of floats stacked in a vertical direction, where vertically adjacent floats are connected to each other; and two partition plates provided on the inner peripheral side of the uppermost and lowermost floats, respectively, of the plurality of floats, the inner peripheral surface of the floating body and the two partition plates form a closed accommodation space for accommodating evacuees by preventing water from entering from the outside, and a door for evacuees to enter and exit the accommodation space is provided in the two partition plates.

Provided is a shelter floating device which enables an amphibious shelter to stably float on a surface of waters. The shelter floating device is provided on a lower surface of the amphibious shelter, and has a protruding floater, a Scott Russell mechanism unit, and a jack (operating means). The protruding floater is connected to the jack through the Scott Russell mechanism unit, while at the same time, being supported by a support device. The jack is fixed to the lower surface of the amphibious shelter. Consequently, by operating the jack, the protruding floater projects itself to an outside of side surfaces of the amphibious shelter along a perpendicular direction.

Provided is a shelter floating device which enables an amphibious shelter to stably float on a surface of waters. The shelter floating device is provided on a lower surface of the amphibious shelter, and has a protruding floater, a Scott Russell mechanism unit, and a jack (operating means). The protruding floater is connected to the jack through the Scott Russell mechanism unit, while at the same time, being supported by a support device. The jack is fixed to the lower surface of the amphibious shelter. Consequently, by operating the jack, the protruding floater projects itself to an outside of side surfaces of the amphibious shelter along a perpendicular direction.