Under the plea agreement, Transocean was also sentenced to five years of probation, the maximum term of probation under law, the Justice Department said.

CNN: STORY HIGHLIGHTS

Long term offenders will continue to be monitored by the probation service for about the same length of time as their prison sentence - for example, an offender given an 18 month sentence will serve nine months in prison, and nine months on licence in the community.

BBC: UK Politics