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Dolphin ferry companies are listed here.

Dolphin 2000 - new version, not sure it has the same soul. (Up 8/10/14; posted 1/11/03)

Fueling the dolphins. A hose runs from the tanker truck into the center open deck area where it attaches to a fitting. No huge infrastructure, just get it done. (Thira's Athinios port, October 1998.)
Another example of low-tech virtue. A passenger is being helped on by one of the harbor police on the left) and an agent of the ferry company while a crew member waits in the doorway. There is a fin that projects from the side of the boat (the thin white horizontal line). It's just a short step off the dock to the fin. (Thira, 1998.)
The dolphin is a hydrofoil. Once free of the harbor, it speeds up and rises on its fins. Here is is slowing and about to drop out of hydrofoil mode. (Hydra, 2012.)
I didn't know that double-decker dolphins existed before I saw this one. Never ridden on them. (Mykonos, 1998.)
Dolphin in Piraeus harbor, 2009. The average dolphin carries about 140 people.
Balloons celebrate something. (Hydra, 2009.)
Sometimes you can ride back here. (Hydra, 2009.)
The captain awaits the signal to go. At Hydra, 2009.
Being obsessed with safety does cut down the fun. (Aegina, 2009.)
A Ceres dolphin rests at Paros in 1986.
Last modified 22 Jan 2015; posted 8/25/99; original content © 2015, 1999 John P. Nordin