In one example, a boat includes a deck, a pair of pontoons configured to be attached beneath the deck and configured to support the deck, and a railing configured to be attached on top of the deck. The boat is configured to be arranged within a standard sized shipping container during storage or transport of the boat. In this manner, the boat may be collapsed for storage or transport, and expanded for use in operation of the boat. Thus, the boat may be readily assembled by a purchaser, operator, or other user.

A hull for deployment as an underwater habitable vessel is described. The hull has at least two hull wall modules connected in series to enclose an interior volume of the underwater habitable vessel. The interior volume is bounded by the hull wall modules. There is also provided a kit of parts for a hull of an underwater habitable vessel. The kit comprises at least two hull wall modules configured to be connected in series to enclose an interior volume of the underwater habitable vessel. The interior volume is bounded by the hull wall modules when connected.

Watercraft with dual, in-line flotation are detailed. Front and rear floats may be bridged by a seating assembly and allow both feet-up and feet-down positioning of a user of the craft. The watercraft may be disassembled and then reassembled compactly for transport or storage, with the compactly reassembled craft including wheels or capable of being placed onto a hand trolley if desired to facilitate its carriage. Also detailed are watercraft in which forward flotation is provided by two front floats forming a pontoon configuration.

Watercraft with dual, in-line flotation are detailed. Front and rear floats may be bridged by a seating assembly and allow both feet-up and feet-down positioning of a user of the craft. The watercraft may be disassembled and then reassembled compactly for transport or storage, with the compactly reassembled craft including wheels or capable of being placed onto a hand trolley if desired to facilitate its carriage. Also detailed are watercraft in which forward flotation is provided by two front floats forming a pontoon configuration.

A catamaran oil production apparatus is disclosed for producing oil in a marine environment. The apparatus includes first and second vessels that are spaced apart during use. A first frame spans between the vessels. A second frame spans between the vessels. The frames are spaced apart and connected to the vessels in a configuration that spaces the vessels apart. The first frame connects to the first vessel with a universal joint and to the second vessel with a hinged connection. The second frame connects to the second vessel with a universal joint and to the first vessel with a hinged or pinned connection. At least one of the frames supports an oil production platform. One or more risers or riser pipes extends from the seabed (e.g., at a wellhead) to the production platform (or platforms). In one embodiment, the production apparatus includes crew quarters.

A variety of multi-use, configurable watercraft is disclosed. A first type of watercraft used in a first water-based activity may be used as a component in a second type of watercraft used in a second water-based activity. For example, a stand-up paddleboard (SUP) may be used for paddle boarding, and then converted into a kayak, sailboat, catamaran, motorboat, or other type of vessel by adding one or more components to the SUP. In one embodiment, two paddleboards are used to construct a variety of multi-hull watercraft.

A pontoon pedal boat includes a multi-piece frame, removable outriggers, inflatable pontoons, and a multi-section pedal drivetrain. The boat may be disassembled and placed into a small suitcase sized storage case to allow for easy transport of the boat. The boat and storage case are lightweight and the boat may be easily transported to many locations for use.

In a method for transferring a storage medium of power generation energy loaded by a power generation float to a collection base, a power generation float is connected to both sides of a deck part, a power generation float is moved to a collection base, a deck part straddles a long bank projecting on a water surface along a water channel through which a hull can pass along a quay wall of a collection base, a power generation float is anchored in a state where one of the hulls enters a water channel, a hull on at least one side of the deck part is separated from the deck part, and a storage medium capable of storing energy is connected on a side where the hull of the deck part is separated, and the float leaves with the hulls connected to both sides of the deck part.