The trip got me on board Argo, an old fishing trawler-style boat which motored 45 minutes out from Oban harbour.
Skipper Peter Scott is getting a huge amount of interest from film crews.
At present, there is limited capacity for tourists, although they can book a seat on the boat for about $600 each.
Once at the "aggregation" site, just off Titi Island ( home to the distinctive mutton birds) Scott and his crew began trawling for action.
A stinking mess of burley is used to attract the sharks, but also brings in albatross that I imagine usually scavenge from fishing trawlers in the area.
The birds also had a go at half a tuna being dragged on rope through the berley - there for the sharks to play with when they eventually arrived.
They say on the boat: "The sharks are here when the birds disappear."
Sure enough, the birds lifted away and the cry of "shark" went up.
The first sign was the classic image of a fin cutting through the water. It moves fast - much faster than you could swim and perhaps even faster than you could run on dry land.
As I watched, the first was joined by others until there were five sharks, some as long as 6m, circling the boat and charging at the tuna bait. An overseas documentary crew at the end of the boat seemed at times to be too close for comfort when one shark went for their underwater camera.
They can turn quickly. With no warning and a flick of its tail, this massive shark turned its fin on the bait and went the other way.
On the boat - and even in the shark cage beneath the water - I never felt at risk. It was common sense. Stay away from the sharks and they can't get you. The sign on the cage made the point - "WARNING", it said in big red letters. "Do not stick any body parts outside this cage."
It was exhilarating. I was close enough to see their raw power. They are captivating and terrifying.
