Abstract: A system and method for obtaining a sediment core sample utilizing a stationary frame assembly including a first drive mechanism, and at least one traveling frame assembly movable in a first direction relative to the stationary frame and carrying at least one core tube and carrying a second drive mechanism for each core tube. The first drive mechanism, activated by a controller, is configured to advance the traveling frame in the first direction until a selected parameter is achieved. The second drive mechanism is configured to drive the core tube to a fully extended position in the first direction, when the selected parameter is achieved, by applying a constant force while driving the core tube to the fully extended position. An occlusion mechanism blocks the opening of each core tube after the core tube is removed from the sediment.

Abstract: The systems and methods described herein provide a reconfigurable, long-range, optical modem-based underwater communication network. In particular, the network provides a low power, low cost, and easy to deploy underwater optical communication system capable of being operated at long distances. Optical modem-based communication offer high data rate, omni-directional spatial communication in the visual spectrum. The omni-directional aspect of communication is advantageous because precise alignment of communication units may not be required. The optical modems may be deployed via unmanned underwater vehicles (UUVs) and physically connected by tethers.

Abstract: The systems and methods described herein provide a reconfigurable, long-range, optical modem-based underwater communication network. In particular, the network provides a low power, low cost, and easy to deploy underwater optical communication system capable of being operated at long distances. Optical modem-based communication offer high data rate, omni-directional spatial communication in the visual spectrum. The omni-directional aspect of communication is advantageous because precise alignment of communication units may not be required. The optical modems may be deployed via unmanned underwater vehicles (UUVs) and physically connected by tethers.