From the site:
During winter, 5000 humpbacks whales make the long journey from the Antarctic to Australia's northern coastal waters for nature's answer to Schoolies week - Mating Season
Here's your chance to have front row seats to see 40 tonnes of blubber playing and flirting right before your eyes.
The captains at ProDive are experts when it comes to coaxing whales out into the open air.
Hop aboard (from Darling Harbour, Manly or Rose Bay) to enjoy a short scenic cruise around the harbour before heading out past The Gap to around 3 nautical miles off shore.
Southern right whales, minke whales, false killer whales, killer whales and pilot whales can make guest appearances, as well as Migaloo, a rare male white Humpback often sighted around Sydney.
Your 3.5 hour tour includes afternoon tea and promises small groups to ensure no fighting for the best spot.
Plus, you receive a 2-hour introductory scuba diving lesson in a heated pool, usually $97.
Lucky Sydneysiders. :-)