A communication system (1) comprising a first and a second underwater wearable device to be worn by a swimmer at mutually distant locations is disclosed herein. The communication system is configured to derive information pertaining to the swimmer from properties of a version of the acoustic signal transmitted from a first communication module of the first underwater wearable device to a second communication module of the second underwater wearable device.

The systems and methods described herein include releasable storage devices that can surface with data. The devices include data storage, an antenna, battery and means to propel the device to the surface or into the atmosphere. In certain embodiments, it is a USB memory stick, a battery, suitable buoyancy, and an antenna. In certain embodiments, the systems and methods described herein include a rocket to boost the system out of the water to a higher altitude. Once the system is airborne, it can transmit data to a ship or satellite via radio communications, via other line of site methods such as optical, or may be captured by an aircraft such as a UAV.

The systems and methods described herein include releasable storage devices that can surface with data. The devices include data storage, an antenna, battery and means to propel the device to the surface or into the atmosphere. In certain embodiments, it is a USB memory stick, a battery, suitable buoyancy, and an antenna. In certain embodiments, the systems and methods described herein include a rocket to boost the system out of the water to a higher altitude. Once the system is airborne, it can transmit data to a ship or satellite via radio communications, via other line of site methods such as optical, or may be captured by an aircraft such as a UAV.

An underwater bi-directional wireless image data communication system includes a wireless image communication device having a comparison processing device for converting an image signal about image data from an image device into an electrical signal, a light emitting unit for receiving the electrical signal from the comparison processing device and converting the electrical signal into an optical signal to output light, and a light receiving unit for receiving an external optical signal and converting the external optical signal into an electrical signal to be output as an image, and an illumination diffusion device for providing illumination having higher intensity than illumination of the light emitting unit to a communication area between wireless image communication devices when underwater bi-directional wireless communication is performed using the wireless image communication devices.

Systems and methods for communicating a signal over a hydraulic line in a vehicle are provided. In one embodiment, a system can include a hydraulic line. The hydraulic line can include at least one communication medium for propagating a communication signal. The system can also include at least one signal communication device configured to receive the communication signal communicated over the hydraulic line. The system can also include at least one vehicle component in communication with the at least one signal communication device.

Systems and methods for communicating a signal over a hydraulic line in a vehicle are provided. In one embodiment, a system can include a hydraulic line. The hydraulic line can include at least one communication medium for propagating a communication signal. The system can also include at least one signal communication device configured to receive the communication signal communicated over the hydraulic line. The system can also include at least one vehicle component in communication with the at least one signal communication device.

An ultra-low or very low frequency communication device composed of: a circuit unit operative to produce an alternating current; and a dipole antenna connected to receive the alternating current and to convert the alternating current into electromagnetic radiation. The antenna is composed of an unshielded radiating conductor and a shielded return conductor connected in series with the radiating conductor, and the return conductor is shielded by a Faraday shield such as a collisionless plasma column that surrounds the return conductor to prevent any electromagnetic radiation from the return conductor.

Messages on controller area network (CAN) buses are communicated over subsea links. Messages are sent as electrical or optical signals. The present invention provides a subsea CAN BUS electronic distribution unit (EDU) for transmitting, receiving, converting, and routing electrical or optical signals sent over a subsea CAN BUS network. The CAN BUS EDU of the present invention is contained within a single housing and combines the functions of transmitting, receiving, converting, and routing electrical or optical signals sent over a subsea CAN BUS network that would typically be handled by multiple devices.

Messages on controller area network (CAN) buses are communicated over subsea links. Messages are sent as electrical or optical signals. The present invention provides a subsea CAN BUS electronic distribution unit (EDU) for transmitting, receiving, converting, and routing electrical or optical signals sent over a subsea CAN BUS network. The CAN BUS EDU of the present invention is contained within a single housing and combines the functions of transmitting, receiving, converting, and routing electrical or optical signals sent over a subsea CAN BUS network that would typically be handled by multiple devices.

A wet mate optical connector in combination with a wave division multiplexer, there being a plurality of input fiber optic cables on an input side of the multiplexer and a fiber optic cable on an output side of the multiplexer connected for providing multiplexed optical signals from the input cables to the wet mate connector.