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The Laguna

A Deep Diver created for the use of Exploration into the further depths deeper than the Mariana Trench on Earth, if there were actually places deep enough on Earth that it could traverse in..

The Lagunas sent to Europa were further outfitted with a prototype Drone between the Ballast pockets.

It's Reliability is as good as the many technical malfunctions it has aboard it after so many repairs and outfitting. (A contradicting statement.)