Ships(boats)

We have all seen that forge is getting a new map tidal but for some time I’ve been thinking what would happen if the UNSC came upon a water world? Since we don’t see any boats in and of the halo games so if the UNSC did find a world made up of water but had a important resource on it (under the water) how would the UNSC adapt to this new place?

They probably have them buts boats just dont fit the halo sandbox.