tender for additional development of ratna i and nlm 14 project.; i) survey spread ii) dive survey spread (jacket face survey) iii) jacket installation derrick barge spread iv) deck installation spread for well head platforms (v) riser installation barge spread vi) saturation diving spread (dp vessel) for diving works e.g. for riser clamp installation/ free span correction/crossings installation / sub-sea tie-in of preinstalled risers. vii) hook-up / modification and accommodation barge spread. viii) transportation spread (cargo barge + tow tug). ix) pipelay barge spread x) hydro test spread (xi) cable lay barge spread (xii) any other spread, if required