What is this underwater vehicle called?

Hmm. asked:


It is not a submarine. It is some circle thing, kinda like a pod, and a person sits in the middle of the circle thing/pod, and you can like go anywhere. What is this called?
these?

http://www.fraseryachts.com/YachtImages.ashx?PicType=T&H=435&W=622&YachtID=Y14_MR_SD&PicID=pi71_SE

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Tagged as: Submarine, Underwater Vehicle