Azerba, a Pakistani in his 20s, sits crammed with dozens of other illegal immigrants in a Greek detention center but he knows the worst is over: he made it across the Evros River into "Europe."
Under Greek law, his release from this holding facility in the northeast near the Turkish border is only a matter of time.
"I will soon be out, and I'm heading for Athens," he said behind his cell bars.
Azerba, who gave only his first name, is one of thousands of would-be migrants intercepted every year in Greece.
Many come from countries in conflict -- such as Iraq, Afghanistan or Iran -- while others claim to have lost their identification papers or invent identities to avoid expulsion.
And many know that under Greek law, migrants from warzones or countries where dissidents could be brutally treated cannot be deported home or detained for more than three months, the legal limit. After this, they are released with a document requiring them to leave Greek territory.
"The Evros region has become one of the main points of passage of clandestine immigrants from the Middle East and Central Asia," said a British immigration officer, who declined to be named, investigating human trafficking here for the EU border agency Frontex.
"And the flow is growing," he said.
At the southeastern flank of Europe, Greece has long been an entry point for illegals hoping to reach Italy, France, Britain or other EU states.
But as these countries tighten up, more and more migrants are staying in Greece, dodging arrest and drifting from one low-paying job to another for months.
Last year alone, some 100,000 illegals were picked up all over the country, said Public Order Minister Vyron Polydoras.
The figure, given in April, marked a break with earlier official reticence about detailing the extent of the illegal immigration. But now, Greece is seeking assistance.
"We're at the extreme end of the EU border and I'm crying out to Europe, I'm asking for help," said Polydoras.
Parts of the Greek-Turkish frontier have been likened to a war zone where hundreds of special police patrol every night, equipped with thermal cameras, helicopters, motorcycles and all-terrain vehicles.
But the flood of immigrants never stops. They swim across the Evros River, which forms a natural border with Turkey, or cross in boats, then head towards Greek towns nearby.
"We do our best to deter them from crossing the Turkish frontier but once they're on Greek soil we usually can't expel them anywhere," said Margaritis Tomazis, the commander of border guards in the region of Thrace.
"It cost me 300 euros [US$407] to cross the river. After that you walk and walk, and you'll inevitably get arrested," said Mohammed, a Palestinian from Gaza.
Mohammed, who said his journey through Lebanon, Syria and Istanbul cost 4,000 euros in all, like many came with a game plan.
"I work in the restaurant business. I want to go to Crete, where I have a contact," he said. "I adore Greece, people are very nice here."
A European diplomat close to the issue who asked not to be named said this was typical.
"People want to settle where they have contacts, family and work possibilities. Now, you see more and more people from Pakistan or China living in central Athens. It's clearly a factor drawing other people from these countries," he said.
At the sole road passage between Greece and Turkey, the border post in Kipi, every truck entering Greece is now given detailed inspection, including for tell-tale presence of carbon dioxide -- betraying human breath.