A six-seater submarine will take the public down to the wreck of HMS Scylla in Whitsand Bay in Cornwall.
The submarine has an acrylic viewing pod
The £1.5m craft, which will be used at locations all over the world, is on a year's trial with the National Marine Aquarium (NMA) in Plymouth.
Her first dive with fee paying passengers on board will be later this summer, but passenger prices have yet to be agreed.
Marlin Submarines constructed the 11m-long craft at its Plymouth workshop.
The sub, which can carry passengers down to 160ft, has an acrylic viewing pod.
Aquarium Chief Executive Mike Leece said: "The potential is vast.
"Imagine being able to dive down and see what the divers can see is a fantastic opportunity."
Project director Juan Romero said a dive would cost between £150 to £1,000, depending on the time.
Alicia's designer and builder Paul Moorhouse said he was delighted she would be around for a while.
The Scylla has settled on the seabed
He said: "Usually when we build a submarine they disappear across the world and we don't get to play with them.
"It's going to be much more fun this time with the extended contact with the vehicle."
The Scylla, decommissioned in 1993, was bought by the NMA and sunk off Whitsand Bay in March.
Divers have been visiting the vessel almost every day and webcams are due to beam images of the vessel back to the aquarium.
The Scylla has settled on the seabed close to the Liberty ship James Eagan Lane, torpedoed on her maiden voyage in 1944.