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Cruise ship
Operated by Silversea Cruises
Photo: William Murphy (infomatique) · CC BY-SA 2.0 · file
Largest in this registry
#41,731
of 84,014 with a recorded tonnage
Largest cruise ship
#410
of 504 of this type with a recorded tonnage
Largest in its fleet
#8
of 8 in this fleet with a recorded tonnage
In brief
Exploris One is an ice-strengthened expedition cruise ship built by Rauma shipyard in Finland. She was launched in 1989 as MS Delfin Clipper and was the first luxury cruise vessel built at this shipyard. Over the period 1989 to 2001 she operated under several names before being acquired by Society Expeditions, who operated her from 2001 to 2007 under the names World Discoverer and World Adventurer. In 2007, she was purchased by Silversea Cruises and after a major refit was renamed Prince Albert II, becoming the first expedition cruise vessel in the Silversea line. In April 2011, she was renamed Silver Explorer.
After 15 years in the Silversea fleet, Silver Explorer was sold to Exploris Cruises and Expeditions in January 2022. She was transferred to Exploris in September 2023 and began sailings as Exploris One in December 2023. Exploris was liquidated in November 2025 and the ship was sold at auction to the Nordic Group.
In February 2026, Heritage Expeditions, an expedition cruise company operating from Christchurch, New Zealand, announced that the vessel would join their expedition cruise fleet and be renamed as Heritage Discoverer, with voyages commencing in May 2027.
Vessel particulars
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
Construction
Measurements
In context
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 6,130 gross tons, Exploris One is the 41,731st largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT. The largest measures 499,167 GT.
Among the 665 cruise ships held here, it ranks 410th by tonnage — larger than 19% of that group. Their median tonnage is 43,009 GT, and the largest tenth begin at 143,289 GT. The flag most often flown by this group is The Bahamas (133 ships). The yard that appears most often against it is Fincantieri, with 112 hulls on record.
The Bahamas is the country of registry for 1,614 vessels in this directory, of which Exploris One is the 1,354th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (940 ships), and the median vessel measures 30,020 GT. Browse every ship flagged The Bahamas.
Narrowing to both dimensions at once, this registry holds 133 cruise ships flying the The Bahamas flag, of which 117 are larger by tonnage.
Exploris One was built in 1989, making it 37 years old. It is one of 1,131 hulls in this registry delivered that year, a cohort whose median tonnage is 1,938 GT; within it this ship is the 310th largest. Across the whole of the 1980s the registry holds 13,213 vessels, median 3,004 GT. The median build year across the entire registry is 1995.
The registry attributes 62 vessels to Rauma-Repola, with a median tonnage of 4,646 GT, delivered between 1956 and 1991. See the rest of that yard’s output.
At 108.1 m overall, Exploris One is 90.0 m shorter than the 198.1 m median for cruise ships on record, with a beam of 15.6 m and a draft of 4.4 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8806747 this registry holds 50 other vessels, whose median build year is 1989 and which range from 1987 to 1991. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1989.
Its IMO number, 8806747, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 8×6 + 0×5 + 6×4 + 7×3 + 4×2 = 157 — and the last digit of that total, 7, must equal the seventh digit, 7. It does, so this number is well formed.
Nearest by tonnage among cruise ships
| Ship | Built | Gross tonnage |
|---|---|---|
| MV Hondius | 2019 | 6,603 |
| Lyngen | 1982 | 6,471 |
| Silver Origin | 2020 | 6,365 |
| Exploris One (this ship) | 1989 | 6,130 |
| Alexander | 1966 | 5,933 |
| Celebrity Flora | 2019 | 5,922 |
| MS Arion |
Same yard, same years
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.
Same fleet
Provenance
Vessel recordWikidata, released under CC0, keyed on this ship’s IMO number.
Written summaryQuoted from Exploris One on English Wikipedia, reused under CC BY-SA 4.0.
PhotographBy William Murphy (infomatique), reused under CC BY-SA 2.0.
| 1965 |
| 5,888 |