Abstract: According to the present invention there is provided an underwater inspection assembly (1,100) comprising, a first unmanned underwater vehicle (2) which comprises, at least a first propeller (3a), at least a first camera (4a), and at least a first optical transceiver (5a); a tether (7) a first end (7a) of which is connected to the first unmanned underwater vehicle; a docking station (21,121) which attached to the first unmanned underwater vehicle (2), and wherein the docking station (21,121) is configured to receive docking means (22, 122) mounted on at least a second unmanned underwater vehicle (12); at least a second unmanned underwater vehicle (12) comprising, at least a second propeller (3b) which can be operated independently of the first propeller (3a), at least a second camera (4b), and at least a second optical transceiver (5b), wherein said at least first and second optical transceivers (5a,5b) are configured to selectively optically communicate with one another; and a docking means (22, 122) which i

Abstract: An optical communication assembly (2) suitable for use underwater, the assembly comprising, a plurality of optical communication modules (3), each module (3) comprising at least one optical receiver (3a) which can receive optical signals, and at least one optical transmitter (3b) which can selectively transmit data in the form of an optical signal; wherein each module (3) is configured to initiate the transmission of data in response to the module (3) receiving a transmit command, and, wherein each module (3) is configured to receive the same clock signal (Clk) which clocks when the module (3) transmits said data, so that the optical transmission of the plurality of modules (3) is synchronised; a bus cable (5), which is connected to all of said optical communication modules (5), along which data can be sent, and along which the clock signal (Clk) can be sent; a control module (11) which is connected to the bus cable (5), and which is configured to selectively provide a data signal along the bus cable (5), whi

Abstract: A receiver (70), suitable for use in a communication assembly configured to operate underwater, the receiver comprising, at least first one or more photodetectors (62a) and second one or more photodetectors (62b), wherein the first one or more photodetectors (62a) define a first detection area which can receive light, and the second one or more photodetectors (62b) define a second detection area which can receive light; at least a first multiplexer (74) which is configurable to selectively electrically connect any of the first one or more photodetectors (62a) or second one or more photodetectors (62b) to a signal detector module (66); a controller (75) which is connected to said least a first multiplexer (74) so that the controller (4) can selectively configure the first multiplexer (74) to electrically connect any of the first one or more photodetectors (62a) or second one or more photodetectors (62b) to the signal detector module (66); wherein, the controller (75) is configured to, configure the first multi

Abstract: The present invention relates to an underwater propelling device (10) i a stator (20) comprising circumferential arrayed coils (35) and being adapted to generate a controlled electromagnetic field along an axial direction, a shaftless propellant rotor (30) comprising: at least two magnetized ring-shaped plates, respectively an upper magnetized plate (31) and a lower magnetized plate (32), coaxially spaced-apart along said axial direction and perpendicular thereto such that said circumferential arrayed coils (35) are positioned therebetween, each plate (31, 32) defining a central aperture (31a, 32a) and having a circumferential array of radially extended magnetized poles (34) embedded therein, said magnetized poles (34) generating a magnetic field which interacts with the electromagnetic field of the stator (20) so as to cause the rotation of said plates (31, 32) about a central axis (ZZ?) parallel to said axial direction, at least one ring-shaped propeller (33) defined by its outer periphery and its inner