Sacred: Thousands of people gathered at Gallipoli in 2005, where the commemoration took an inappropriate turn.

Sacred: Thousands of people gathered at Gallipoli in 2005, where the commemoration took an inappropriate turn. Photo: Reuters

Gallipoli, Turkey: There's been a crackdown on Aussie larrikinism at Gallipoli since 2005 when, most people agree, the commemorations to mark the 90th anniversary of the Anzac landings became crass.

Organisers played the Bee Gees hits Stayin' Alive and You Should be Dancing on big screens and young pilgrims got drunk and slept on graves.

Authorities have striven over the past decade to ensure the services are now solemn and respectful.

But on Wednesday there was a return – of sorts – to a bygone era.

A small dive ship dropped anchor at North Beach less than 100 metres from the commemorative site that will host Friday's dawn service.

Twenty tourists, most with Australian or New Zealand accents, jumped into the water to swim where the Anzacs landed 99 years ago.

They cheered at the cold chill and later dived off the ship's roof into the Aegean Sea.

Australian services director Tim Evans was quickly on the phone to request the Turkish coast guard move on the small vessel.

"Anzac Cove and North Beach are heritage sites protected under Turkish law," he said.

"So what the people are doing there at the moment is illegal. The boat shouldn't be that close and people shouldn't be swimming off the boat."

Mr Evans suspects those on the boat weren't aware they were technically breaking the law.

But the government official said the coast guard was "particularly aware" that on Thursday and Friday there shouldn't be any ships at the military heritage sites.

They were meant for reflection and commemoration, he said.

"They'll be proactively managing the two coves from tomorrow.

"I don't think that what they (the swimmers) are doing is appropriate and we've taken steps to respond."

AAP