The French fuel group said it had traced the leak to a gas pocket in a rock formation 4km (2.5 miles) below the seabed but 1km above the gas reservoir being tapped by the Elgin platform, which was evacuated on March 25 when the leak was discovered.
Total called in an exploration ship carrying the remote-controlled mini-sub, which is equipped with cameras, March 27 in an effort to assess the underwater leak on the rig.
The ship, the Highland Fortress, was standing by March 28 outside a two-nautical mile (3.7 kilometres) exclusion zone around the platform.
“It is currently on standby, should the need to deploy arise,” the Total spokesman said.
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