hull

Sand dabs and halibut, still edible and plentiful there, were held in a net slung under the hull and served moments later.

The plan was to build its hull - the part where the passengers would sit - out of carbon fibre.

The sub imploded 90 minutes into the dive after its carbon-fibre hull suffered a catastrophic loss of structural integrity, the investigation found.

“Investigators did not find any evidence of a hull leak, grounding, or contact with an object,” the report states.

A 10-year-old boy was rescued after being trapped in an air pocket in the upturned hull, local media say.