A catamaran lifting apparatus is disclosed for lifting objects 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. Each of the frames provides a space under the frame and in between the barges that enables a package to be lifted and/or a marine vessel to be positioned in between the barges and under the frames. In this fashion, an object that has been salvaged from the seabed can be placed upon the marine vessel that is positioned in between the barges and under the frames.

An expansion deck system for vessels includes a frame assembly for positioning between a stationary floor of a vessel and a plurality of pontoons of the vessel. The frame assembly including a first side with a first elongated opening, and a second side with a second elongated opening. One or more sliding deck members are telescopically connected to the frame assembly by one or more sliding rails and transition between a retracted position and an extended position. In the retracted position the one or more sliding deck members are positioned between the floor and pontoons of the vessel, and in the extended position the one or more sliding deck members are positioned alongside the frame assembly.

A shallow draft sampling raft including a bow, and a stern, in which the bow is an opposite end of the raft from the stern. The raft also includes a top surface, a bottom surface, and a plurality of longitudinal stringers. The plurality of longitudinal stringers are attached to an inner face the bottom surface and run from the bow to the stern. A top surface is also attached to the longitudinal stringers.

A shallow draft sampling raft including a bow, and a stern, in which the bow is an opposite end of the raft from the stern. The raft also includes a top surface, a bottom surface, and a plurality of longitudinal stringers. The plurality of longitudinal stringers are attached to an inner face the bottom surface and run from the bow to the stern. A top surface is also attached to the longitudinal stringers.

A measuring device measures a status of a device to be monitored stored within a metal hull of a marine vessel. A first communication device is provided outside the hull and transmits a status signal indicating a measurement value of the status of the device to be monitored. A second communication device receives the status signal via the first communication device and outputs information pertaining to the status. The second communication device is configured to be portable.

A measuring device measures a status of a device to be monitored stored within a metal hull of a marine vessel. A first communication device is provided outside the hull and transmits a status signal indicating a measurement value of the status of the device to be monitored. A second communication device receives the status signal via the first communication device and outputs information pertaining to the status. The second communication device is configured to be portable.

A drilling system configured to install a tap assembly into a ship skin is disclosed. The drilling system comprises a remotely-operated underwater vehicle and a drilling assembly configured to be operated by the remotely-operated underwater vehicle. The drilling assembly comprises a frame comprising an attachment element configured to hold the drilling assembly to a surface of the ship skin. The drilling assembly further comprises a drill actuation system comprising a linear actuator attached to the frame and a rotary actuator, wherein an actuation of the linear actuator is configured to move the rotary actuator relative to the frame to install the tap assembly into the ship skin by driving the tap assembly with the rotary actuator and the linear actuator.

A drilling system configured to install a tap assembly into a ship skin is disclosed. The drilling system comprises a remotely-operated underwater vehicle and a drilling assembly configured to be operated by the remotely-operated underwater vehicle. The drilling assembly comprises a frame comprising an attachment element configured to hold the drilling assembly to a surface of the ship skin. The drilling assembly further comprises a drill actuation system comprising a linear actuator attached to the frame and a rotary actuator, wherein an actuation of the linear actuator is configured to move the rotary actuator relative to the frame to install the tap assembly into the ship skin by driving the tap assembly with the rotary actuator and the linear actuator.

A system for rotating inner and outer propeller shafts via a driveshaft. The system includes a stub shaft extending between forward and aft ends, the aft end having an engagement feature for engaging with the inner propeller shaft such that rotating the stub shaft rotates the inner propeller shaft. A reverse gear and a forward gear are each rotatably coupled to the stub shaft. The reverse gear and the forward gear mesh with the driveshaft and are engageable to become rotatably fixed to the stub shaft such that rotating the driveshaft rotates the stub shaft in reverse and forward directions, respectively. An outer driving gear is coupled to the inner propeller shaft to rotate therewith. An outer driven gear is coupled to the outer propeller shaft and a pinion rotatably coupling the outer driving gear to the outer driven gear such that rotation of the outer driving gear rotates the outer propeller shaft.

A system for rotating inner and outer propeller shafts via a driveshaft. The system includes a stub shaft extending between forward and aft ends, the aft end having an engagement feature for engaging with the inner propeller shaft such that rotating the stub shaft rotates the inner propeller shaft. A reverse gear and a forward gear are each rotatably coupled to the stub shaft. The reverse gear and the forward gear mesh with the driveshaft and are engageable to become rotatably fixed to the stub shaft such that rotating the driveshaft rotates the stub shaft in reverse and forward directions, respectively. An outer driving gear is coupled to the inner propeller shaft to rotate therewith. An outer driven gear is coupled to the outer propeller shaft and a pinion rotatably coupling the outer driving gear to the outer driven gear such that rotation of the outer driving gear rotates the outer propeller shaft.