There's no denying it, most people really don't know how fabulous our seas are.
We tend to celebrate the coast and our great maritime history and yet we often overlook what's just under the surface in our coastal waters.
As a diver for over 40 years, you can imagine that Britain's Secret Seas feels like the ultimate way for me to share my love of British underwater adventures.
My big hope was that we could make a great programme that revealed the true wonder of Britain's seas and make it look easy and attractive to explore.
I kept thinking about a family of non-divers watching, and hoping that our programme might inspire them to give it a try.
I would love to see that family experience basking sharks like we did.
We snorkelled with a shiver of about 12 huge basking sharks only 100 metres or so from the beach at Porthcurno in Cornwall.
They are shy of noise. Bubbles from scuba diving equipment or jumping in from the boat sends them away, so the snorkelling approach works well.
We found that if you just float motionless at the surface they come very close indeed.
It's exciting. Even though we know that basking sharks are not predatory there is something gripping about a 10-metre-long shark swimming towards you with that massive open mouth. How about that as part of a family day at the seaside?
There are four one-hour episodes from Britain's north, south, east and west, with each episode having a core theme.
Frank was leading the history and ocean ecosystems stories, Tooni was leading the marine science, with me being the lead diver, presenter and expedition leader.
But it's not just about diving. Being underwater is a great setting in which to bring important stories to life.
In the Wild North episode I report on some of our military activities by diving with the Royal Navy clearance divers to explode 1,000lb bombs.
And the Bustling South and the Giants Of The West episodes reveal exciting history and conservation stories when we dive some of our important shipwrecks.
Britain's Secret Seas is the realisation of a dream for me.
I remember the early 1960s when my life's heroes were in their prime - Hans Hass was using military diving gear to film his fabulous shark documentaries.
And my big hero at the time, Mike Nelson, was up to his neck in Sea Hunt adventures.
Beautiful women were hiring Mike for diving lessons and at the end of each programme I would swear that he was talking directly to me with his words on diving safety.
I had just failed my 11-plus, hated school, loved the sea and knew nothing. Except that I wanted to be a diver.
Paul Rose is the co-presenter of Britain's Secret Seas.
You can read more from Paul about a dolphin autopsy he carried out on BBC News online.
For further programme times, please see the upcoming episodes page.
Comments made by writers on the BBC TV blog are their own opinions and not necessarily those of the BBC.