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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.

The team’s array of seafloor electrodes, sensitive to the conductivity of water, captured a subducting seamount that appeared to have a conductive interior covered by a thin resistive crust.

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.