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His passion is fishing — Bagby dreams of reeling in a deep-sea marlin — but no hobby can nourish his soul as much as helping others.

One study published in Science earlier this month found that with 44,000 deep-sea dives, just 0.001% of the deep seafloor has been visually observed — which is roughly the size of Yosemite National Park.

Many other countries and environmental groups oppose deep-sea mining in international waters without further research.

Former Conservative defence and Foreign Office minister Tobias Ellwood has warned that the UK is "behind the curve" in tracking Russia's deep-sea operations.

The deep-sea sabotage is most worrying because it can take a repair boat several weeks to find a break and initiate a fix.