MS World Discoverer

Information compiled from the internet, about the vessels of Discoverer Reederei (Bremen) and Society Expeditions. ¹

MS World Discoverer
MS Society Explorer
MS Society Adventurer
MS World Discoverer (2)

MS World Discoverer

Built 1973/74 by: F. Schichau / Schichau-Werft, Schichau Unterweser in Bremerhaven Germany
Built n°: 2250
Other names: MS Bewa Discover , MS Thomas Lowell (and “the Little Blue Ship”)
Apparently she was also called MS Lowell Thomas World Discoverer some time, but I can only find a postcard online about it, after I heard about it on Facebook. And the “Lowell Thomas” is not visible a ship’s name… 
30.04.2000 struck a rock, transferred to Roderick Bay, Nggela Islands, where she sits today
My former cabin (behind the reception) is under the waterline.

Sources with more details:
Wikipedia (check out the other languages of all Wikipedia pages I mention, content differs)
Earl of Cruise blog post from 2017 (German, no Impressum/Author mentioned)

MS Society Explorer

Built in 1969 by: Uudenkaupungin Telakka, Finland (1973 verkauft an Rauma Repolla siehe WD2)
– or was it Nystads Shipard?
Build n°: 260
Other names: Explorer, Lindblad Explorer (and “the Little Red Ship”)
23. November 2007: sunk in Antarctica (all pax and crew saved by MS Nordnorge, Hurtigruten, my then ship)

Sources with more details:
Wikipedia
Seite über die Werft
Schwedische Website

MS Society Adventurer

Built 1990/91 by: Finyards / Rauma Repola, Finland
Built n°: 306
Other names: MS Hanseatic, MS / RCGS Resolute

Sources with more details:
Wikipedia (4/2020 with wrong first name of vessel, calling it SE instead of SA)
Schwedische Seite
About One Ocean Expeditions  and the Resolute

MS World Discoverer (2)

Built 1989 by: Rauma Repola, Finland
Built no: 304
Other names: Delfin Clipper, Sally Clipper, Baltic Clipper, Delfin Star, Dream 21 – WD – World Adventurer, Prince Albert II, Silver Explorer

Sources:
Berlitz Cruising & Cruise Ships 2018
Schwedische Website
German Luxury Ocean Liners
Wikipedia