27 Mhz FM Rx Tx for arduino

hey, I'm building an underwater ROV and want to control it from the surface.Only small frequencies can penetrate water. I think 27 MHz that is used for Rc toys would be a suitable one. any ideas where I can purchase them or SOCs

From an RC supplier. Salt water and fresh water are very different, I believe there is some stuff out
there on the web about RF transmission to submersibles.