Transocean's $2.7bn acquisition of Ocean Rig shows that consolidation is the best form of survival in tough oil and gas markets.

This is according to VesselsValue (VV) head of offshore Charlie Hockless.

He said: "This acquisition makes Transocean the largest MODU owner by value, with a total fleet (live, on order and joint ventures) worth $8bn.

"The VV value of Ocean Rig’s assets at $2.6bn,