Your equipment sounds expensive. You must be a professional photographer. I am just an amateur and found smaller and lighter, less complicated underwater cameras Work best for my hobby. My nephew has a slightly bigger camera than mine and he takes very good photos with them. I state these because you might want to ask professional photographers how they travel with their stuff in the airplane. I am thinking that they put them in a special case, let the airlines know about it, and check fees and/or insurance for them. Liveaboards do not have much space, so that will be another concern as mentioned by LattitudeAdjustment. If you don’t need to take this particular camera on this trip, consider a smaller, more compact camera to tote with you. As an additional thought, the boat or yacht you will be on may need you to get in the water from a height. How your camera goes in and out of the water may be a concern.
Just my 2 cents. I hope it helped you any.