Calypso by John Denver, Album: Windsong (1975)

To sail on a dream on a crystal clear ocean
To ride on the crest of the wild raging storm
To work in the service of life and the living
In search of the answers to questions unkown
To be part of the movement and part of the growing
Part of beginning to understand

Aye, Calypso, the places you've been to
The things that you've shown us
The stories you tell
Aye, Calypso, I sing to your spirit
The men who have served you
So long and so well

Like the dolphin who guides you
You bring us beside you
To light up the darkness and show us the way
For though we are strangers in your silent world
To live on the land we must learn from the sea
To be true as the tide
And free as a wind-swell
Joyful and loving in letting it be

Aye, Calypso, the places you've been to
The things that you've shown us
The stories you tell
Aye, Calypso, I sing to your spirit
The men who have served you
So long and so well

A song about the famous Jacques-Yves Cousteau’s research ship “Calypso” and it’s contribution to public knowledge and awareness of the importance of undersea life.
We read in wikipedia:

John Denver was a close friend of Jacques Yves Cousteau, and wrote another song about him but died shortly before the song was planned to be recorded. Calypso is the name of Jacques Cousteau's famous research boat that sailed around the world for oceanic conservation, but sunken shortly before Cousteau died.

Also in wikipedia, we can track the adventures of the vessel after the accident:

A barge accidentally rammed Calypso and sank her in the port of Singapore in 1996. She was raised, and towed to France. After a time in the port of Marseilles, she was towed to the basin of the Maritime Museum of La Rochelle in 1998, where she was intended to be an exhibit. A long series of legal and other delays kept any restoration work from beginning. At one time it was rumoured that Calypso had been sold to Carnival Cruise Lines for the symbolic sum of one Euro. Carnival stated that they intend to give the vessel a 1.3 million dollar restoration, and then likely moor her in the Bahamas as a museum ship. See this cyber diver news page for details of this plan and developments. At the end of 2006, most of the equipment had been removed from her upper decks, and she was unprotected from the elements. It was unclear what would become of this historic vessel.
Francine Cousteau has managed to organise the ship's restoration.[1] On October 11, 2007, the transfer of the ship to Concarneau started, where she will be restored at the Piriou Shipyard and transformed into a permanent exhibit

You can hear this song in youtube