OceanCraft is out for 1.7.10, at least on the MCF page. So is Mariculture, so on hiatus/abandoned or not, it'll work for the near-term foreseeable future of mod packs. Botania/Natura add some ocean features, though not a ton. BoP adds ocean biomes and a few little things like coral. MoCreatures adds ocean/water mobs, but not terrain features. LotsOMobs and Aquatic Abyss seem to be on 1.7.2 still, which may be compatible but isn't a good sign on update speed. Then there are Shipwrecks! (1.7.10), Animals+ (same), Ocean Adventures (1.7.2), and weather mods like Coros (Local Weather) and Climate Control.
However, you're not in the right place. You want Platform Pagoda. This section is actually for custom mod requests. So I moved the thread.