This segment is from Thursday's edition of 'Digging for Value', in which sector analysts Joel South and Taylor Muckerman discuss energy & materials news with host Alison Southwick. The twice-weekly show can be viewed on Tuesdays & Thursdays. It can also be found on Twitter, along with our extended coverage of the energy & materials sectors @TMFEnergy.

Within a week, CEOs from two of the biggest players in the offshore drilling market announced their retirements. The situation at National Oilwell Varco (NYSE:NOV) seems a bit more put together, with COO Clay Williams having held multiple roles within the company and clearly groomed for the role. The story over at Ensco (NYSE:VAL) is a bit more unclear. Tune in below for Motley Fool analyst Taylor Muckerman's feelings on both situations.