Zero-LTI Year on a Semi-Sub: Inside a Verdant Helm Rollout

A semi-sub in the Central North Sea closed out 12 months without a lost-time incident across 365 days of continuous drilling. The rig's OIM credits the garden view for surfacing three specific near-miss clusters early. This is the rollout postmortem, with the honest caveats about what zero LTI does and does not prove.

On 18 April 2010, a Transocean-operated semi-sub completed seven years without a lost-time incident. Twenty-two days earlier the rig had received a BP safety award for its occupational safety record. On 20 April 2010 the Macondo well blew out, killing eleven crew and triggering the largest marine oil spill in US history. The BP Deepwater Horizon Accident Investigation Report later documented that process-safety failures had been accumulating on the rig for weeks while its LTI record stayed perfect. The IADC Macondo Lessons analysis concluded that excellent occupational LTI records can coexist with catastrophic process-safety failure.