Years of neglect at the ancient Roman city of Pompeii are being dug and scrubbed away in a last-minute bid to keep money flowing from a huge European Union-backed renovation programme.

Workers in hard hats beaver away as tourists visiting the Italian World Heritage site peer through screens and wire fences at ruins of ancient houses where restorations are going into overdrive.

Submerged under volcanic ash when Mount Vesuvius erupted in 79 AD, Pompeii is one of the most visited archaeological sites in the world, giving a unique glimpse into daily life under the Roman empire.

But years of mismanagement and corruption have exacerbated decay at the sprawling, 163 acres site, prompting the European Union to intervene.

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A worker pushes a wheelbarrow as he crosses an ancient Roman cobbled street at the Unesco World Heritage site of Pompeii, where extensive restoration work is taking place

A sign hanging on a fence reading 'prohibited access' shows how much work is being carried out

In 2012, it pledged €78 million euros (£56 million) to finance urgently needed repairs. Italy threw some €27 million (£20 million) behind the Great Pompeii Project, which aims to rebuild collapsed arches, right sagging walls, clean frescoes and protect the area from waterlogging.

Fast forward three years and only around €21 million (£15 million) out of the total €105 million (£76 million) on offer has been spent. Unless the site managers do the rest of the work by the original December 31 deadline, they risk losing access to this money to pay for it.

'We are really working against the clock,' said superintendent Massimo Osanna, an ex-university professor chosen by the government to take over in early 2014 to make a break with the site's scandal-ridden past.

'If the timing had been respected more at the beginning we wouldn't have this concentration of work that is causing problems now,' Osanna said in a makeshift workshop where technicians are restoring plaster casts of Vesuvius's victims.

Years of mismanagement and corruption have exacerbated decay at the sprawling, 163 acres site, prompting the European Union to intervene

The Great Pompeii Project aims to rebuild collapsed arches, right sagging walls, clean frescoes and protect the area from waterlogging

The project got bogged down in squabbles over who should lead the work and extra checks and balances put in place to keep contracts from falling into the hands of the local mafia. Osanna said the pace of work has almost doubled since late 2014, with around 30 technical interventions underway.

'It has become a really busy city,' he said. 'Not just visitors but workers, engineers, architects, experts - just think of managing the parking. These are all small things but taken together they become enormous.'

The hive of activity is causing headaches at a site which attracts more than 2.5 million visitors a year.

'People find houses closed, lots of construction sites open, and it is difficult to get around,' said Stefano Vanacore, who has directed the restoration of several homes of ancient Pompeians, including the recently re-opened Villa dei Misteri.

'If it weren't for the December deadline we would have done everything more gradually,' he said.

Pompeii was a large Roman town (marked) in the Italian region of Campania that was destroyed by a volcanic eruption from nearby volcano Mount Vesuvius in 79AD

Pompeii is one of the most visited archaeological sites in the world, giving a unique glimpse into daily life under the Roman empire

The hive of activity is causing headaches at a site which attracts more than 2.5 million visitors a year

Twenty new technicians have been hired, but there is still not enough help to go around, said architect Maura Anamaria, who is overseeing 18 million euros-worth of restorations.

'Each of us needs help and you cannot satisfy everyone's demands, you just can't. There are too many sites open and each one is complex,' Anamaria said.

Even after the current flurry of work is over, the site will need a long-term maintenance programme to keep it from degrading again as it had when former prime minister Silvio Berlusconi's government declared a state of emergency in 2008.

A third of the city has never been excavated and soil movements threaten the fragile ruins. Earlier this month, heavy rain raised the floor in the house of Roman nobleman Julius Polybius. Italy now has until the end of 2015 to present a request to the European Commission to take the project into the following year with new funding.

The project got bogged down in squabbles over who should lead the work and extra checks and balances put in place to keep contracts from falling into the hands of the local mafia

The pace of work has almost doubled since late 2014, with around 30 technical interventions underway

A Commission spokesman said it would be possible for Pompeii to get funding in its next financing period, and the Commission was more concerned with the quality of the work than the timeframe as it is a high-profile sign of how well the EU's regional funds can work.

In Italy meanwhile, the situation is an emotive example of centuries-worth of art and architecture left to decay as a cash-strapped state failed to adapt to modern economic realities and slashed funding for the arts.

A March report from UNESCO, the United Nations Educational, Scientific and Cultural Organization, said the project was making 'excellent progress' and called on the government to make sure it had enough money and manpower to ward off more collapses.

Preserved paintings: The Villa dei Misteri features some of the best-preserved frescoes in the remains of Pompeii and is classed as a Unesco World Heritage Site

Pompeii, a busy commercial city overlooking the Mediterranean, was destroyed in A.D. 79 by an eruption of Mount Vesuvius that killed thousands of people and buried the city in 20 feet of volcanic ash

One of the frescoes that has been restored to its former glory at the Villa of the Mysteries at the ancient archaeological site of Pompeii

Two of the frescos, which are now available to view in the ancient city of Pompeii, after it opened up to the public once again - but there is still work to do as the restoration project continues

As in the cases of the Colosseum in Rome and the Rialto Bridge in Venice, the private sector has stepped in. Aerospace and defence group Finmeccanica donated technology, and healthcare instrument maker Philips lent a CAT scanner to analyse the plaster casts, which were taken from the cavities left behind when victims' bodies decayed under the ash.

Vanacore says the work underway should have started long ago, but the current flurry is a vital step towards protecting one of Italy's greatest assets. 'If we see the walls aren't falling down, it means the heritage is being protected,' he said.

Unesco have, however, said they are pleased with how the project is progressing, but the worry of losing cash funding is still prevalent