Deep-dive pioneer Hannes Keller after reaching a depth of nearly 394 feet in Zurich in 1959.(RDB/ullstein bild Dtl./Getty Images)Hannes Keller, a Swiss deep-sea explorer who survived a record descent to more than 1,000 feet in a diving bell during a 1962 expedition that helped open new frontiers in ocean research but claimed two lives in the process, died Dec. 1 at his home in Niederglatt, Switzerland.
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