According to the author, why is the descent of Walsh and Picard to the deepest part of the ocean "largely forgotten today"?

The only reason is 1960s were dominated by the race to the moon and the Americans were proud to be the first nation to get there. The race to the depths of this planet was quickly eclipsed by the race to the moon

Explanation:

For the first time in history, on January 23, 1960, two men, Lieutenant Don Walsh and Jacques Picard, descended to the deepest part of the ocean, the bottom of the Challenger Deep in the Mariana Trench located in the Pacific Ocean western. While this feat was international news, the race to the depths of this planet was quickly eclipsed by the race to the moon, and no one has gone so deep since then. And for the past 50 years, we have continued searching.