Thirteen pages of notes written by an Auschwitz inmate forced to help Nazi murder squads during World War II have finally been deciphered, 37 years after being buried on the grounds of the death camp.

Marcel Nadjari, a Greek Jew, described in his notes how thousands were being taken 'packed like sardines' to gas chambers daily.

At 26 years old, he was one of 2,200 members of Sonderkommando, a group of Jewish prisoners forced to escort fellow Jews to the chambers and aid with the disposal of their bodies.

Nadjari penned an account of his time the infamous death camp in 1944 and stuffed the 13-page manuscript into a Thermos flask, which he then buried near Crematorium III.

Marcel Nadjari, a Greek Jew, described in his notes how thousands were being taken 'packed like sardines' to gas chambers daily. At 26 years old, he was one of 2,200 members of Sonderkommando, a group of Jewish prisoners forced to escort fellow Jews to the chambers and aid with the disposal of their bodies. He's pictured above before being taken to Auschwitz

Nadjari penned an account of his time the infamous death camp in 1944 and stuffed the 13-page manuscript into a Thermos flask, which he then buried near Crematorium III

His notes were left undiscovered until 1980, when a Polish forestry student dug them up at the camp

Now, 73 years later, the notes have finally been decoded by Russian historian Pavel Polian, who used digital imaging to decipher what the man said

Now, 73 years later, the notes have finally been decoded thanks to digital imaging.

'Often I thought of going in with the others, to put an end to this. But always revenge prevented me doing so. I wanted and want to live, to avenge the death of Dad, Mum and my dear little sister,' he wrote in his notes.

He had heard from fellow Jews that his mother, father and sister Nellie had all died at the Auschwitz-Birkenau camp, in Nazi-occupied southern Poland.

In his manuscript, Nadjari explained the horrors of leading fellow prisoners to the gas chambers every day.

'The crematorium is a big building with a wide chimney and 15 ovens,' he wrote, the BBC reported. 'Under a garden there are two enormous cellars. One is where people undress and the other is the death chamber.'

In the notes he, wrote that he had heard from fellow Jews that his mother, father and sister Nellie had all died at the Auschwitz-Birkenau camp, in Nazi-occupied southern Poland

Nadjari also explained the horrors of leading fellow prisoners to the gas chambers every day

As part of the Sonderkommando, Nadjari was forced to burn the bodies, and collect women's hair and cold filings before throwing the ashes into a nearby river

When his notes were found by a Polish forestry student in 1980, they were virtually unreadable, as wet soil had caused ink to fade on 90 per cent of the documents

The Sonderkommando was forced to burn the bodies, and collect women's hair and cold filings before throwing the ashes into a nearby river.

'People enter it naked and once about 3000 are inside it is locked and they are gassed. After six or seven minutes of suffering they die,' he wrote.

He also detailed the way that Nazis disguised the gas chambers as a showering area by installing pipes.

'The gas canisters were always delivered in a German Red Cross vehicle with two SS men. They then dropped the gas through openings — and half an hour later our work began,' he wrote.

'We dragged the bodies of those innocent women and children to the lift, which took them to the ovens.'

Nadjari was one of the few inmates to survive Auschwitz and was transferred to the Mauthausen concentration camp in Austria as the Third Reich collapsed.

He went on to marry and moved to New York in 1951, where he made a living as a tailor and had two children with his wife, Rosa.

Nadjari was one of the few inmates to survive Auschwitz (pictured) and was transferred to the Mauthausen concentration camp in Austria as the Third Reich collapsed.

Nadjari died aged 53 in 1971 - nine years before his Auschwitz notes were discovered.

When his notes were found by a Polish forestry student in 1980, they were virtually unreadable, as wet soil had caused ink to fade on 90 per cent of the documents.

But Russian historian Pavel Polian has now used digital imaging to re-create the messages and they have now been decoded for the first time.

The Institute of Contemporary History in Munich published Polian's findings in German last month.

'The inmates obviously discussed how many trains had arrived,' Mr Polian told the BBC. 'Nadjari's desire for revenge stands out - that's different from the other accounts.

'And he pays much more attention to his family. For example, he specifies who he wants to receive his dead sister's piano.'