I’ve followed this quite closely and think the most important things are these:</p>
<p>Modification of the BOP to make testing easier.
The dead battery on the dead man.
The BOP design (three different lines need to be severed to activate the deadman?).
The leak on the hydraulic line to the BOP.
Not closely monitoring the pits.
Casing design.
Not making the appropriate judgement calls upon seeing pressure readings, etc.</p>
<p>I work onshore production so anything I’ve found is primarily from reading other expert opinions (and I know personnel at Cameron/Transocean who are experts…).</p>