Due to various phenomena like salinity, temperature and turbidity etc., data transmission in the underwater medium is challenging. Conventionally used underwater communication methods are electromagnetic waves and acoustic waves, which have a huge loss of information and narrow bandwidth, respectively. Since underwater communication has major applications in defence and oceanographic research, there is a need for a method with less loss of information and low latency. Hence Li-Fi can be used as an alternative for acoustic waves. In this context of our project, we used IR uplink, which is secure and does not interfere with VLC. This does also reduce the effect of absorption and scattering. For the safe transmission of data, NEC protocol is used

Li-Fi, Acoustic Waves, VLC, IR Uplink, NEC Protocol.