A personal watercraft includes a ship body and a recovery water passage. The ship body includes a deck and a hull. The recovery water passage is provided in the hull, and includes a water intake opening through which water can be taken in when the ship body plains on a water surface, and a discharge opening through which the taken water is discharged. The recovery water passage is formed with a filter accommodation space that accommodates a filter that traps minute foreign matters contained in water flowing through the recovery water passage.

A personal watercraft includes a ship body and a recovery water passage. The ship body includes a deck and a hull. The recovery water passage is provided in the hull, and includes a water intake opening through which water can be taken in when the ship body plains on a water surface, and a discharge opening through which the taken water is discharged. The recovery water passage is formed with a filter accommodation space that accommodates a filter that traps minute foreign matters contained in water flowing through the recovery water passage.

An ultra-fast trimaran deep water and littoral naval ship suited to combat, search and rescue, and/or deployment operations has a plurality of semi-planing hulls connected to the underside of a deck in a trimaran configuration. Further, a plurality of propulsion stages including a cruise propulsion stage, a wind assisted propulsion stage, and a vectored direct thrust propulsion stage may be independently operated alone or in conjunction to propel the ship at various speeds suited to different situations.

A submarine support ship is preferably a triple-hulled vessel; the lower portion of the ship is a paired-hull catamaran which is capable of deep diving, clasping the submarine at deep sea, and floating upwards together with the clasped submarine. The upper portion of the ship is a buoyancy tank, which can supply air to and pull up the deep-diving lower portion, and can also conduct security of an ocean-going submarine. For the submarine support ship of the present invention, by utilizing a mature deep diving submersible technology, the lower portion of the submarine support ship is manufactured as a deep-diving submersible in a submarine contour form, which is quickly separated from the upper portion of the submarine support ship and dives to reach the submarine position in the deep sea, clasps the submarine and then floats upwards together with the submarine as a whole to the water-surface position, such that the egress hatch of the submarine is docked with a dedicated docking hatch of the submarine support ship, to implement rescue security of the submarine; which mainly solves the problem that the rescue water-depth of current deep-diving lifeboats is shallow, but it also solves the problems that the deep-diving lifeboat has many rescue links, slow speed, and can only save people, but not submarines.

A system for collection of rainwater in the open ocean may include: (a) one or more ocean-going vessels, wherein each ocean-going vessel is configured for collection and storage of rainwater, wherein each ocean-going vessel is configured to drift with surface ocean currents in order to navigate to one or more delivery locations, wherein each delivery location is on or near to a land mass; and (b) one or more delivery stations located at the one or more delivery locations, wherein each delivery station is configured to receive stored rainwater from one or more of the ocean-going vessels.

A system for collection of rainwater in the open ocean may include: (a) one or more ocean-going vessels, wherein each ocean-going vessel is configured for collection and storage of rainwater, wherein each ocean-going vessel is configured to drift with surface ocean currents in order to navigate to one or more delivery locations, wherein each delivery location is on or near to a land mass; and (b) one or more delivery stations located at the one or more delivery locations, wherein each delivery station is configured to receive stored rainwater from one or more of the ocean-going vessels.

This ship includes a ship body, a fuel tank chamber, a stern-side engine room, a bow-side engine room, a main fuel line and a sub-fuel line, and a pump mechanism. The main fuel line connects a fuel tank, a stern-side power generation unit, and a bow-side power generation unit through the bow-side engine room. The sub-fuel line connects at least the fuel tank and the stern-side power generation unit, and is disposed through a section different from the bow-side engine room through which the main fuel line passes. The pump mechanism selectively feeds fuel into the main fuel line or the sub-fuel line from the fuel tank.

This ship includes a ship body, a fuel tank chamber, a stern-side engine room, a bow-side engine room, a main fuel line and a sub-fuel line, and a pump mechanism. The main fuel line connects a fuel tank, a stern-side power generation unit, and a bow-side power generation unit through the bow-side engine room. The sub-fuel line connects at least the fuel tank and the stern-side power generation unit, and is disposed through a section different from the bow-side engine room through which the main fuel line passes. The pump mechanism selectively feeds fuel into the main fuel line or the sub-fuel line from the fuel tank.

A system for collection of rainwater in the open ocean may include: (a) one or more ocean-going vessels, wherein each ocean-going vessel is configured for collection and storage of rainwater, wherein each ocean-going vessel is configured to drift with surface ocean currents in order to navigate to one or more delivery locations, wherein each delivery location is on or near to a land mass; and (b) one or more delivery stations located at the one or more delivery locations, wherein each delivery station is configured to receive stored rainwater from one or more of the ocean-going vessels.

A system for collection of rainwater in the open ocean may include: (a) one or more ocean-going vessels, wherein each ocean-going vessel is configured for collection and storage of rainwater, wherein each ocean-going vessel is configured to drift with surface ocean currents in order to navigate to one or more delivery locations, wherein each delivery location is on or near to a land mass; and (b) one or more delivery stations located at the one or more delivery locations, wherein each delivery station is configured to receive stored rainwater from one or more of the ocean-going vessels.