The US Coast Guard has admitted losing track of a catamaran - the last place mother-of-one Isabella Hellmann was seen before she vanished. The vessel has now sunk somewhere off the Bahamas

The US Coast Guard has lost track of a catamaran  – the last place where Isabella Hellmann was seen before she disappeared three weeks ago.

The mother-of-one was on board the catamaran, Surf in Summer, with her British husband, Lewis Bennett, when the boat began sinking off the Bahamas Banks.

Hellmann’s husband told the Coast Guard that he woke up on 15 May after the catamaran “struck something” about 30 miles off Cay Sal.

He said he went on deck to find the catamaran taking on water and no sign of his wife.

A four day search failed to find any trace of 41-year-old Isabella Hellmann, who is from Delray Beach, Palm Beach, Florida.

A missing person investigation has now been launched by the FBI and the US Coast Guard.

Hellmann and Bennett were sailing from Cuba to Florida on a belated honeymoon when the incident happened.

The couple have only been married three months, and have a baby daughter who was not on board at the time.

Missing Florida woman Isabella Hellmann who was last seen on her husband's catamaran in May

Isabella Hellmann’s family have set up a ‘Find Isabella’ Facebook group

Now, the US Coast Guard has admitted losing track of the 37-foot Surf into Summer catamaran.

The Palm Beach Post reported yesterday (5 June) that the US Coast Guard lost track of the boat after the onboard electronic beacon stopped working on 26 May.

It said this was confirmed yesterday by US Coast Guard spokesman, Jonathan Lally, who said that “we haven’t had track of it or seen the boat since.”

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Previously, the Coast Guard said that the retrieval of Surf into Summer was the responsibility of Hellmann’s husband, Lewis Bennett. It added the wreck had been marked and a navigation hazard advisory sent out.

It also stated that it had inspected the boat “the best they could from the surface”, and that the “hulls had neither visible holes nor obvious places where water could have filled them, just deep scrapes at the back ends of each”.

It was too dangerous for divers to explore the inside of the vessel, but the US Coast Guard stated that rescuers had “banged on the side” of the hulls and there was no answer.

A spokesman for the US Coast Guard also added that Hellmann’s body was not thought to be inside the catamaran.