"We have known for some time that the cement used to secure the production casing and isolate the hydrocarbon zone at the bottom of the Macondo well must have failed in some manner, " the letter said, noting that BP used a "nitrogen foam cement" recommended and supplied by Halliburton.

CNN: STORY HIGHLIGHTS

Then there is Halliburton, which was contracted to cement the production liner in the well casing, effectively sealing off the reservoir from the well bore.

FORBES

Halliburton ( HAL - news - people ), which was contracted to cement the production liner in the well casing, effectively sealing off the reservoir from the well bore.

FORBES: The Gulf Oil Leak

Although the unit we saw today has functional guts, we're told that the casing is pre-production -- not to say that "production" BUGbases need to look amazing, anyway, considering that they're frequently used for prototyping themselves.

ENGADGET: Bug Labs' BUGbase 2.0 prototype hands-on Hands-on