There's a spectacular, uncharted alien world right off the Gulf Coast, and a recent National Oceanic and Atmospheric (NOAA) expedition sought to uncover its secrets.

This past December, a NOAA team, aboard the Okeanos Explorer, conducted the first of three month-long studies of the deepest parts of the Gulf of Mexico, with the dual aim of exploring the diversity of deep-water habitats and mapping the seafloor.

Using a mix of remote-operated submersibles (ROVs), and shore-based instruments, the team brought back stunning images of previously unexplored areas.

Here's a sample of what they found in the inky depths: