Keppel Offshore & Marine Ltd (Keppel O&M), through its subsidiaries, Keppel FELS Brasil S.A. and Estaleiro BrasFELS Ltda, has signed a Letter of Intent (LOI) with Sete Brasil Participações S.A. (Sete Brasil), for the design and construction of five additional semisubmersible (semi) drilling rigs based on Keppel's proprietary DSSTM 38E design. The aim of the LOI is to facilitate Keppel O&M's preparation work on these potential projects, pending the signing of the final construction contracts. The total value of the contracts, if and when successfully agreed and executed between Keppel O&M and Sete Brasil, will be approximately $4.12 billion. Earlier in December, 2011, Keppel O&M secured one semi to be built to the same DSSTM 38E design from Sete Brasil.