deep water

“It’s easy on our joints. It’s also hard to move through, so there’s tension. So just moving back and forth, treading water, deep water running, arm movement patterns — it’s all resistance training.”

The NCA said they did not meet UK or EU safety standards and would not have served as adequate flotation aids in deep water.

"The size of the slipways, the access from quayside into deep water is a fundamental requirement for many of the renewable technologies that are going out to sea," Mr Sawyer said.

The authority, which is the global custodian for international deep waters, has granted 31 mining exploration contracts but has not authorized any exploitation as the debate continues.

Remains of the oldest shipwreck ever discovered in deep water, and perhaps the oldest complete wreck in any water, have been located in the Mediterranean Sea about 56 miles off the coast of northern Israel.