the series, dive 63 for Piccard) was another checkout dive on 18 December, west of Guam. It reached 5700 ft to test the holding bands and new instrumentation at that depth. Although not usually considered as part of the counted series, there were five shallow 100 ft dives for crew training purposes in Apra Harbor before the next deep dive of the series.

Seventh dive

The next dive (dive 64 in a series, seventh in the Nekton series) reached 24000 ft in the Nero Deep in the Mariana Trench 70 mi off Guam. Although this dive set a

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