Abstract: A system is for monitoring subsea parameters and is deployable in a water column. The system has: a tether to be moored to a seabed; a variable buoyancy member; one or more sensor units for sensing one or more subsea parameters; and a control unit. The control unit has a communication member for receiving data from the sensor unit(s) and for transmitting the data wirelessly to a remote recipient. The variable buoyancy member is adapted to move the communication member between a submerged position and a surface position for the wireless transmittal of data. The control unit is adapted to control the buoyancy of the variable buoyancy member. A non-variable buoyancy member is connected at an upper portion of the tether. The submerged position of the communication member is below the position of the non-variable buoyancy member. A method is for monitoring subsea parameters.