A method of maintaining an offshore power plant. A power generating craft is attached to a tow cable on a floating vessel. The floating vessel is moved to an offshore power generating site. The power generating craft is maintained in an airborne state while the floating vessel is moving to the offshore power generating site. The power generating craft is detached from the tow cable and attached to a first end of a tether line at the offshore power generating site. The second end of the tether line is anchored to an underwater floor. The power generating craft is operated in an airborne state.

An emergency ship arrest system includes a vessel attachment system, a retrieving system, and an anchor system. The vessel attachment system is configured to connect to a vessel at sea, and includes a bridle system and a hawser line. The bridle system is operatively connected to the hawser line's proximal end. The bridle system is configured to engage at least four fittings on a foredeck of the vessel to distribute the load over the foredeck. The retrieving system includes a retrieving line with a proximal end that is detachably connected to the hawser line's distal end in a setup position. The anchor system includes a main rode and a para sea anchor. The main rode's proximal end is detachably connected to the hawser line's distal end in an anchor position.

A structure such as a pipeline bundle is pulled into or through shallow water, for example when launching the structure, by applying a tensile pulling force to the structure through rigging that extends to the structure from a winch of a first vessel. The pulling force is at least partially reacted through a pennant line that extends from the first vessel to a second vessel and that hangs between the first and second vessels to engage the seabed soil frictionally. The vessels may also self-propel to contribute their thrust to the pulling force. The pennant line includes a clump weight such as a bundle of chains that can be repositioned easily for additional pulls by being lifted between the vessels before being lowered to the seabed at a new location.

The present invention includes systems and methods for a continuous-wave (CW) radar system for detecting, geolocating, identifying, discriminating between, and mapping ferrous and non-ferrous metals in brackish and saltwater environments. The radar system (e.g., the CW radar system) generates multiple extremely low frequency (ELF) electromagnetic waves simultaneously and uses said waves to detect, locate, and classify objects of interest. These objects include all types of ferrous and non-ferrous metals, as well as changing material boundary layers (e.g., soil to water, sand to mud, rock to organic materials, water to air, etc.). The radar system (e.g., the CW radar system) is operable to detect objects of interest in near real time.

The present invention includes systems and methods for a continuous-wave (CW) radar system for detecting, geolocating, identifying, discriminating between, and mapping ferrous and non-ferrous metals in brackish and saltwater environments. The radar system (e.g., the CW radar system) generates multiple extremely low frequency (ELF) electromagnetic waves simultaneously and uses said waves to detect, locate, and classify objects of interest. These objects include all types of ferrous and non-ferrous metals, as well as changing material boundary layers (e.g., soil to water, sand to mud, rock to organic materials, water to air, etc.). The radar system (e.g., the CW radar system) is operable to detect objects of interest in near real time.

Marine survey source route configuration can include towing, via a first marine survey vessel, streamers at a first average speed and at an average velocity along a first survey route. A second marine survey vessel can tow a source at a second average speed that is greater than the first average speed along a second survey route that periodically passes over the first survey route and at the average velocity in a direction of the first survey route.

Marine survey source route configuration can include towing, via a first marine survey vessel, streamers at a first average speed and at an average velocity along a first survey route. A second marine survey vessel can tow a source at a second average speed that is greater than the first average speed along a second survey route that periodically passes over the first survey route and at the average velocity in a direction of the first survey route.

An unmanned vessel system can include a hull system configured to provide buoyancy, one or more seismic sources configured to generate seismic energy, and a deployment apparatus configured to deploy the seismic sources from the hull system to a water body or water column. A control system can be configured to operate the deployment apparatus, in order to deploy the one or more seismic sources so that the seismic energy propagates through the water column. A compressed air source can be provided on board the unmanned vessel system, with a source line configured to provide compressed air to the seismic sources.

Provided is a nautical sector, in particular a catamaran boat including a first catamaran craft functioning independently, having a prevailing direction of longitudinal development along the median axis (x) and including a bow, a stern, motor means and directional means; a second catamaran craft functioning independently, having a prevailing direction of longitudinal development along the median axis (x) and including a bow, a stern, motor means and directional means, where said first catamaran craft and said second catamaran craft each include joining means for their mutual stable coupling, obtained matching the relative sterns, on a transverse junction plane (Π), to carry out said catamaran boat able to function as a single unit.

A tow attachment for a watercraft is disclosed. The tow attachment is configured to attach a tow rope to the watercraft, and has a first part and a second part that is connected to the first part by a connecting portion. The first part is configured for rigid connection to the watercraft, and the second part is configured to attach to the tow rope. The second part disconnects from the first part about the connecting portion in response to the tow rope applying a load above a predetermined load to the second part. A tow pylon assembly having a tow pylon and the tow attachment connected to the tow pylon is also disclosed. A watercraft with the tow attachment and a watercraft with the tow pylon assembly are also disclosed.