Is THIS how to stop killer whales ramming boats? Sailors say they're blasting heavy metal music out underwater to deter orcas

Sailors have started to blast out heavy metal music through underwater speakers in a bid to stop killer whales ramming boats in southwestern Europe.

Such attacks have become a big problem in the region — but animal behaviouralists have no idea why they are on the rise or what is causing the creatures to act this way.

It has got so bad that pods of killer whales have even been known to damage boats and capsize vessels, with sailors resorting to desperate measures in an effort to deter the attacks.

Some say playing heavy metal music is a 'game changer' in tackling the problem, but others aren't convinced.

Boat operators have shared their tips on social media platforms such as Facebook, including via a group called 'Orca Attack Reports' which has 60,000 members. 

'When we had an interaction last year, I’m pretty sure that rattling the hull by playing full volume east European thrash metal was the game changer,' said one person.

'They made three approaches and left after 5 mins without doing any damage... which was 2 or 3 minutes into the music.'

When asked for tips on how to deal with killer whales attacking, another Facebook user added: 'Heavy metal, or drum and bass. Turned up loud...'

However, German sailor Florian Rutsch, who operates a catamaran for voyages in the Iberian Peninsula, told The New York Times that he had tried a similar method and it hadn't worked.

Mr Rutsch said a pod of killer whales hit the rudders of his vessel and disabled its steering, despite him having thrown sand into the water and playing heavy metal music in an effort to deter them.

'It is scary,' said Mr Rutsch, who had to have his boat towed away after calling the Spanish authorities for help.

'No one knows what works, what doesn't work.'

That hasn't stopped someone creating a Spotify playlist called 'Metal for Orcas', however. 

Among the songs on it are 'Stretched and Devoured', 'Infinite Terror' and 'The Blood of Power'. 

There has been an increasing number of reports of orcas attacking boats off the Iberian coast since 2020.

Scientists say it could be that the killer whales are just playing games when they ram boats and rip off their rudders, or it may be linked to past trauma. 

Some have suggested the animals could be trying to avenge their matriarch after she was struck by fishermen. 

Either way, marine experts think the behaviour is spreading through the orca population off the coast of Spain because younger killer whales are learning it from their elders.

The whales have been captured on video ripping yachts' rudders off and working in groups in hundreds of coordinated attacks which have left boats needing to be towed back to harbour.

At least three have been sunk since 2020.

In 2022 there were 207 attacks recorded by scientific researchers, compared to just 52 during a five-month period in 2020.

Around 60 orcas live in Spanish waters, with a concentration off the Galician coast and in the Strait of Gibraltar, where the majority of recent attacks have taken place.