Ye olde Victorian era Bathysphere, for ye diverse and sundry explorations of ye Deeps...
A blob with bits on, basically... The portholes look emptily black in the image, but they actually use that old shiny texture BioWare used on their mirrors which looks anything between fathomless black and bright silver depending what angle you look at it and thus the portholes are a bit more "glassy" than they may appear here.
My ATLANTIS Modules begin with the arrival of a Victorian Professor, his granddaughter (and an obviously doomed diving bell operator who gets eaten in the first ten seconds) in the crystal-roofed, long since sunken continent of Atlantis. They arrive by means of this Bathysphere, the professor hoping to prove his theories upon the lost continent of Atlantis and finding considerably more than he imagined...
They find the imperious, callous Atlanteans to be enslaving people whose vessels are drawn down from the surface by arcane powers. They find that monstrous aquatic Spleens (such beasts are mandatory in my Modules) infest the whole realm and attack everything in sight, the Bathysphere included, stranding them at the bottom of the ocean... And that their arrival begins a chain of political change and manipulation within the citadel of Atlantis which may have unimaginable repurcussions for not only the lost world at the bottom of the sea but also the surface world as well...
Atlantis is defended by the last power of Moon and Sun which Atlantis harvested whilst on the surface thousands of years earlier, these powers made corporeal in the form of Selena, the Moon Goddess (the central character, yes, the tall, voluptuous, blue individual above) and her brother, Helios, the Sun God, the twin Guardians of Atlantis... though as Selena learns from the professor's granddaughter about the Suffragette movement and discovers what slavery really means to those under the whip, she begins to vehemently question what she's guarding...
All of which you utterly don't really need to know, since it just means you get a rusty metal ball with bits sticking out. If you want one. And if you can think of anything worthwhile of your own to do with a Bathysphere in NWN...