Subsea 7 — Kristian Siem's offshore contracting company — has clinched a huge cable-laying contract from oil major Petrobras in Brazil.

The "very large" award, worth between $500m and $750m, will see the company's fleet of cable-layers install 190 km of lines in the Santos basin.

The work supports development of the Mero-3 field about 200 km off the coast of the state of Rio de Janeiro, at 2.2