Abstract—This investigation presents a contemporary approach that strategies reducing the challenges associated with underwater communication in terms of extending data transfer speed and signal quality. Minimizing these obstacles via combining Orthogonal Frequency Division Multiplexing (OFDM) as an approach to data transmission with cuttingedge technologies in hybrid networks that use Non-Line-Of- Sight (NLOS) Underwater Wireless Optical Communication (UWOC), besides Free-Space Optical (FSO) and optical fibre as a connection channel between terrestrial networks and underwater platforms. Using OFDM between 7.5 and 2.4 GHz for UWOC and Wi-Fi for water’s surface platforms demonstrates a method to improve the overall spectrum usage and expand the wireless communication ability for both water’s surface platforms and the underwater scenarios. The system performance behavior has been improved by using multiple-path underwater NLOS channels with amplifiers, achieving a receiving depth of 30 meters in the coastal ocean and 80 meters in the Clear Ocean at 3.7E-22 Bit Error Rate (BER) at 1 Gbit/s. The heterogeneous network proposal leverages the strengths of each technology capability while offering high data rates, robustness, and flexibility, essential for a variety of applications in marine research, underwater robotics, and wireless communications.