A distributed borehole system includes a surface-based assembly located on a surface of a body of water and a marinized assembly located on a floor of the body of water adjacent to a borehole in an earth formation. The system includes a borehole interrogator including a transmitter configured to generate a signal and to transmit the signal into the borehole and a receiver configured to receive a reflected signal from the borehole based on the signal transmitted by the transmitter. The system further includes a processor configured to process the reflected signal to generate data representing characteristics of one of the borehole system, the borehole, and an earth formation defining the borehole. The processor is located in the surface-based assembly, the receiver is located in the marinized assembly, and the transmitter is located in at least one of the surface-based assembly and the marinized assembly.