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But then, just as Hercules crossed over a ridge, a curious sight floated across the screen: small, almost iridescent bulbs clinging to the seamount wall.

Thousands of deep-sea octopuses gather on the flanks of a seamount off California’s coast.

That suggested the volcanic rocks inside the seamount were also rich in water, trapped by an impermeable cap, the team concluded.

The Connecticut, one of three advanced Seawolf submarines, hit the uncharted seamount on Oct.

But radar satellites that measure ocean height can also find them, by looking for subtle signs of seawater mounding above a hidden seamount, tugged by its gravity.