Low-pitch.
Another word for an underwater creature is a deep sea creature. Deep sea creatures include the cornuta, the giant isopod and the humpback anglerfish.
Another word for a deep ditch that is dug around a castle is a moat. You could call it a trench, or you could fill it full of water and call it a moat.
Oil
Clot. Embolus. Thrombus. Thrombophlebitis.
Ebony. As deep as Tar, Oil, or the feeling of a funeral. IDK.
Gash
French kiss
Low-pitch.
deep
Another word for an underwater creature is a deep sea creature. Deep sea creatures include the cornuta, the giant isopod and the humpback anglerfish.
Another word for a deep ditch that is dug around a castle is a moat. You could call it a trench, or you could fill it full of water and call it a moat.
Oil
onyx
black, gloomy,
ravine, chasm, abyss, canyon, crevasse
Clot. Embolus. Thrombus. Thrombophlebitis.