Artist rendition of the newly upgraded HOV Alvin showing interior layout. Among other improvements to the sub, the new, larger personnel sphere has improved interior ergonomics and five viewports (instead of the previous three) to improve visibility and provide overlapping fields of view. (Illustration by E. Paul Oberlander © Woods Hole Oceanographic Institution)

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Artist rendition of the newly upgraded HOV Alvin showing interior layout. Among other improvements to the sub, the new, larger personnel sphere has improved interior ergonomics and five viewports (instead of the previous three) to improve visibility and provide overlapping fields of view. (Illustration by E. Paul Oberlander © Woods Hole Oceanographic Institution)