Orca: Where and when to dive with them

Orca encounters are heavily regulated in nearly every country, so always understand the local law before you book and dive only with permit-holding operators. All legal in-water encounters are surface snorkelling only — never scuba dive with orcas, because bubbles disturb them. Enter the water quietly from the side of the boat, avoid jumping or splashing, and stay horizontal at the surface with calm breathing and still fins. Do not swim toward the orcas; let them choose whether to approach. Keep groups small — no more than 4–6 swimmers — and stay close together without spreading across the pod's path. Never separate a calf from an adult, never place yourself between pod members, and never touch, feed or block their travel line. If a pod is actively hunting — carousel feeding, a mammal chase or wave-washing — stay out of the water and observe from the boat. Approach distances vary by country: the United States requires 91 metres nationwide under the Marine Mammal Protection Act and 300–400 yards for endangered Southern Resident orcas in Washington waters; Canada mandates 200 metres for all cetaceans and 400 metres for Southern Residents; Norway sets a 20-metre boat distance and caps group sizes for licensed in-water encounters; Iceland's IceWhale code requires 50 metres and limits vessels to three per pod; New Zealand prohibits swimming with orcas entirely with a 50-metre minimum approach; Australia recommends 100 metres for boats and 300 metres for jet-skis and also prohibits swimming; the EU and Antarctica (IAATO) require 100 metres, increasing to 200 metres when calves are present; and Mexico (SEMARNAT) requires a permit, limits boats to one per pod within 240 metres, and allows snorkelling only through authorised operators.

There is no single global orca season — the best time to see them depends entirely on where you are. In Norway (Skjervøy and Andenes), the peak runs from mid-November to late January, when herring gather and licensed operators offer in-water snorkelling. Iceland offers winter sightings around Snæfellsnes from November to February and summer opportunities near the Westman Islands. In Mexico's Sea of Cortez, the window is October to May, with the highest chances from December through April. Western Australia's Bremer Bay hosts the famous Bremer Canyon aggregation from mid-January to mid-April. Argentina's Península Valdés is best in February to April for the unique beach-stranding hunt. Antarctica delivers encounters during the Austral summer from November to March. In the Pacific Northwest — including the San Juan Islands, Johnstone Strait and Vancouver Island — visit between May and September for Resident and Bigg's orcas. New Zealand offers year-round sightings, especially around Auckland, the Bay of Islands and Kaikoura. Because orcas are wild, free-ranging apex predators, no destination can guarantee an encounter. Plan a 5–7 day window in the peak weeks and be prepared for weather cancellations.

Orcas are the most widely distributed marine mammal on Earth, found in every ocean from the tropics to the polar ice edges. They are most reliably encountered in cold, productive waters where large concentrations of prey gather. In Norway, the fjords around Skjervøy and Tromsø host winter aggregations from late October to mid-January that follow the migrating herring shoals. Iceland's Snæfellsnes Peninsula sees resident pods hunting herring between February and April, while northern Vancouver Island (Johnstone Strait, Blackfish Sound) is home to fish-eating "Resident" pods from July to September. In the eastern North Pacific, mammal-hunting "Bigg's" (Transient) orcas patrol the Salish Sea year-round, and the Aleutians and Kamchatka support offshore populations. Southern Hemisphere hotspots include Peninsula Valdés in Argentina (February–April) where orcas beach themselves to catch sea lion pups, the Antarctic Peninsula and Ross Sea (December–March) where Types A, B and C hunt seals and minke whales, New Zealand's coasts where orcas specialise in stingrays, and the Sea of Cortez off Baja California (October–May) where they herd mobula rays. Tropical sightings do occur — particularly around the Galápagos, Sri Lanka and the Strait of Gibraltar — but they are far less predictable than the high-latitude hotspots.

Diet is entirely dependent on the orca's ecotype, and different populations never interbreed or share prey. Resident orcas of the North Pacific are strict fish-eaters, with Southern and Northern Residents specialising almost exclusively on Chinook salmon. Bigg's (Transient) orcas of the same region hunt marine mammals: harbour seals, sea lions, porpoises, and occasionally minke and grey whale calves. Offshore orcas of the outer North Pacific specialise in sharks, including sleeper sharks, and their teeth are worn flat from shark skin. Type A Antarctic orcas hunt minke whales in open water, Type B1 "Pack Ice" orcas cooperatively create waves to wash Weddell seals off ice floes, and Type C "Ross Sea" orcas feed on Antarctic toothfish. New Zealand orcas dig stingrays out of the sand, Norwegian and Icelandic orcas use "carousel feeding" to corral herring into tight balls and stun them with tail slaps, and Peninsula Valdés orcas famously strand themselves onto beaches to snatch sea lion pups. In the Strait of Gibraltar a small population targets bluefin tuna, and Sea of Cortez orcas herd and feed on massive schools of mobula rays. Wherever they live, orcas rely on cooperative hunting, culturally transmitted techniques and prey-specific dialects passed down through generations.