
Rig / offshore unit
Discoverer Clear Leader
Operated by Transocean
Photo: U.S. Coast Guard photo by Petty Officer 1st Class Tiffany Carvalho. · Public domain · file
Largest in this registry
#6,992
of 84,014 with a recorded tonnage
Largest rig / offshore unit
#34
of 856 of this type with a recorded tonnage
Largest in its fleet
#1
of 11 in this fleet with a recorded tonnage
In brief
About Discoverer Clear Leader
Discoverer Clear Leader is a double hulled dynamically positioned drillship, capable of operating in moderate environments and water depths up to 12,000 feet (3,657m) using an 18.75 in (47.6 cm), 15,000 psi blowout preventer (BOP), and a 21 in (53 cm) outside diameter (OD) marine riser. The Marshall Islands-flagged vessel is owned by Transocean, and is operating in the Gulf of Mexico of the United States.
Vessel particulars
Identification and dimensions
Every value is as recorded in the source. Blanks are values the source does not hold — none is estimated from a sister ship or a class average.
Identification
- IMO number
- 9386122
- IMO check digit
- Valid
- MMSI
- 538002877
- Call sign
- V7MO2
- Flag state
- Marshall Islands
- Port of registry
- —
- Vessel class
- —
- Status
- in service
Construction
- Type
- Rig / offshore unit
- Builder
- Hanwha Ocean
- Yard number
- Launched
- —
- Year built
- 2009
- Designed to carry
- —
- Owner
- Transocean
- Operator on record
- Transocean
Measurements
- Gross tonnage
- 65,573
- Net tonnage
- —
- Displacement
- —
- Length overall
- 254.0 m
- Beam
- 38.0 m
- Draft
- 13.0 m
- Service speed
- —
- Deadweight
- 10,100 t
In context
How Discoverer Clear Leader compares
Every figure in this section is a count, a rank or a percentile over vessels actually held in this registry — not over the world fleet, which is larger. Nothing here is estimated.
At 65,573 gross tons, Discoverer Clear Leader is the 6,992nd largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT, so this hull is about 11 times the typical vessel on record here. The largest measures 499,167 GT.
Among the 911 rig / offshore units held here, it ranks 34th by tonnage — larger than 96% of that group. Their median tonnage is 9,254 GT, and the largest tenth begin at 51,732 GT. The flag most often flown by this group is Liberia (179 ships). The yard that appears most often against it is Hanwha Ocean, with 27 hulls on record.
Marshall Islands is the country of registry for 3,838 vessels in this directory, of which Discoverer Clear Leader is the 646th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (2,407 ships), and the median vessel measures 32,987 GT. Browse every ship flagged Marshall Islands.
Narrowing to both dimensions at once, this registry holds 117 rig / offshore units flying the Marshall Islands flag, of which 3 are larger by tonnage.
Discoverer Clear Leader was built in 2009, making it 17 years old. It is one of 2,834 hulls in this registry delivered that year, a cohort whose median tonnage is 11,673 GT; within it this ship is the 306th largest. Across the whole of the 2000s the registry holds 18,605 vessels, median 9,957 GT. The median build year across the entire registry is 1995.
The registry attributes 1,090 vessels to Hanwha Ocean, with a median tonnage of 84,214 GT, delivered between 1982 and 2025. See the rest of that yard’s output.
At 254.0 m overall, Discoverer Clear Leader is 180.0 m longer than the 74.0 m median for rig / offshore units on record, with a beam of 38.0 m and a draft of 13.0 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9386122 this registry holds 62 other vessels, whose median build year is 2008 and which range from 2006 to 2011. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 2009.
Its IMO number, 9386122, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 3×6 + 8×5 + 6×4 + 1×3 + 2×2 = 152 — and the last digit of that total, 2, must equal the seventh digit, 2. It does, so this number is well formed.
Nearest by tonnage among rig / offshore units
| Ship | Built | Gross tonnage |
|---|---|---|
| Molikpaq | 1984 | 68,358 |
| Carolina | 2011 | 67,890 |
| Discoverer India | 2010 | 65,790 |
| Discoverer Clear Leader (this ship) | 2009 | 65,573 |
| Jotun A | 1999 | 65,420 |
| Goliat FPSO | 2015 | 64,000 |
| Discoverer Deep Seas | 2000 | 63,190 |
Same yard, same years
Built alongside at Hanwha Ocean
No ship class is recorded for this vessel, so these are not asserted to be sister ships — they are contemporaries from the same builder, shown because that is what the data supports.
Al Ghuwairiya
2008 · 168,189 GT · Marshall Islands

Lijmiliya
2009 · 168,189 GT · Marshall Islands
Al Samriya
2009 · 168,189 GT · Marshall Islands
Dan
2009 · 164,241 GT · Iran
Dore
2009 · 164,241 GT · Iran
Nisalah
2010 · 162,863 GT · Saudi Arabia
Front Eminence
2009 · 162,706 GT · Marshall Islands
Front Endurance
2009 · 162,706 GT · Marshall Islands
Same fleet
Other ships operated by Transocean
Provenance
Where this page comes from
Vessel recordWikidata, released under CC0, keyed on this ship’s IMO number.
Written summaryQuoted from Discoverer Clear Leader on English Wikipedia, reused under CC BY-SA 4.0.
PhotographBy U.S. Coast Guard photo by Petty Officer 1st Class Tiffany Carvalho., reused under Public domain.


