Rescue crews have been drilling three separate wider holes to send down the rescue capsule and hoist the men to the surface.

CNN: Rescue drill reaches 33 trapped Chilean miners

Mr Walker also criticised the US for failing to name or send witnesses to his inquest, also in October, into the deaths of two RAF men shot down by a US missile after completing a bombing raid on Baghdad in 2003.

BBC: NEWS | UK | UK Politics | US 'must send inquest witnesses'