Mermaid Sapphire
| {{Infobox ship begin |display title=ital}}
{{Infobox ship image | Ship image= | Ship caption= }} {{Infobox ship career | Hide header= | Ship country= Panama | Ship flag= {{Shipboxflag|Panama |civil}} | Ship name= Mermaid Sapphire | Ship namesake= | Ship operator= | Ship registry=Panama City, Panama | Ship route= | Ship ordered= | Ship awarded= | Ship designer=Sasaship Pte Ltd | Ship builder=PT Jaya Asiatic Shipyard, Batam, Indonesia | Ship original cost= | Ship yard number= | Ship way number= | Ship laid down= | Ship sponsor= | Ship christened= | Ship completed= | Ship acquired= | Ship maiden voyage= | Ship in service= | Ship out of service= | Ship renamed= | Ship reclassified= | Ship refit= | Ship struck= | Ship reinstated= | Ship homeport= | Ship identification=* {{IMO Number|9563859}}
| Ship motto= | Ship nickname= | Ship fate= | Ship status= In service | Ship notes= | Ship badge= }} {{Infobox ship characteristics | Hide header= | Header caption= | Ship type=ROV & air diving support vessel | Ship displacement= | Ship length= {{Convert|63|m|ftin|abbr=on}} o/a | Ship beam= {{Convert|15|m|ftin|abbr=on}} | Ship height= | Ship draught={{Convert|5|m|ftin|abbr=on}} | Ship depth= {{Convert|6.1|m|ftin|abbr=on}} | Ship hold depth= | Ship decks= | Ship deck clearance= | Ship ramps= | Ship ice class= | Ship power=2 × {{Convert|470|kW|hp|abbr=on}} Volvo + 1 × {{Convert|99|kW|hp|abbr=on}} Volvo emergency generator | Ship propulsion=* 2 × {{Convert|2575|kW|abbr=on}} Caterpillar CPP | Ship speed= | Ship range= | Ship endurance= | Ship boats=SMD Quasar Compact ROV | Ship capacity= | Ship sensors= | Ship EW= | Ship aircraft= | Ship aircraft facilities= | Ship notes= }} |
Mermaid Sapphire is an offshore multipurpose vessel. Built in 2009, the ship is used for mostly research and undersea work.
She is a purpose-built ABS Classed DP2 ROV and air diving support vessel, designed for operation of dual deepwater work-class ROV's (Quasar Compact or Triton XLX) plus optional inspection-class ROV. The ROV's are installed on a dedicated raised deck level, leaving all back deck space for project equipment. Mermaid Sapphire is also equipped with state-of-the-art subsea inspection data acquisition and data management systems. A 23-tonne knuckleboom crane, and auxiliary 5-tonne crane are also installed.
On March 26, 2012, she carried Deepsea Challenger to the Challenger Deep where the first solo dive to the bottom of the trench was made.{{cite web |url= https://www.sciencedaily.com/releases/2012/03/120326091202.htm |title=James Cameron makes first ever successful solo dive to Mariana Trench - ocean's deepest point |work=sciencedaily.com |date=26 March 2012 |accessdate=8 October 2012}}