Poseidon Expeditions
Poseidon Expeditions is a small-ship polar operator founded in 1999, running a single vessel, M/V Sea Spirit, on Antarctica-priority itineraries plus Arctic routes to Svalbard, Greenland and the British Isles. Twenty-seven years in, it remains built around one structural choice: a small-ship passenger count that keeps time on shore high.
- Small ship — up to 114 passengers, ~100 on average, 72 crew
- Maximum time ashore — up to 3 landings per day, each lasting approximately 2.5 hours, no group rotation
- Expert expedition team — naturalists, biologists, geologists, historians
- IAATO & AECO member since 2011
Poseidon Expeditions reviews: what travelers say
Multiple reviewers describe the ship as feeling more like a small yacht than a cruise ship — cabins, corridors and the mudroom are sized for ~100 guests, not a few hundred.
Several travelers single out the expedition team — specifically named specialists in geology and ornithology — for tailoring lectures to what the group actually saw that day.
A recurring theme is that the whole group is ashore together rather than split into timed batches, which reviewers say translates into calmer, less rushed landings.
Cabin comfort and crew attentiveness come up often; a smaller number of reviews note that the more limited onboard public space (bar/lounge) feels modest next to larger luxury ships.