Australia 2012 Road Trip - Dive Flag

On examining the cover of the stamp booklet of the Australia 2012 Road Trip issue, I realized that one of the stickers crowding the back of the vehicle is a dive flag - on the right side of the rear window. I managed to locate it on the stamp too, but it was not easy to see it properly, as the rectangular flag is slightly distorted.

Luxembourg 2012 Scuba diving

For their 2012 edition of "Fun & Liberty" issue, the Luxembourg Post Office released on 25 September 2012, two stamps on the theme high up in the air and down underwater - paragliding and scuba diving. The scuba diving stamp shows the view of an ascending scuba diver from the seabed.
The stamp comes in sheetlets of 5, where the sheetlet selvage is decorated with the same scenery.

Australia 2012 Road Trip - The Great Barrier Reef

Released on 18 September 2012, the Road Trip issue comprises 5 stamps, the one that features "The Great Barrier Reef" has a set of mask and snorkel at the bottom left corner of the design. The same set of stamps is reprised in a miniature sheet, and the 3 60-cent stamps, that include the Great Barrier Reef one, are available as self-adhesives in a stamp booklet.

As part of the WWF Conservation Stamp Collection, Niue released on 5 September 2012, a set of stamps celebrating the giant sea fans. These fans can grow up to spans of 2 metres, and can be found from depths of 10 metres down to 50 metres. Neither the stamps, nor the accompanying souvenir sheet, contain any designs related to scuba diving, however, the first day cancellation for this issue features a scuba diver, to reflect a major tourist experience in Niue.

Ireland 2012 350th Anniversary of the formulation of Boyle's Law.

The An Post of Ireland released a stamp on 5 July 2012 celebrating the 350th anniversary of the formulation of Boyle's Law, a law so very important to understand in scuba diving. The stamp shows a portrait of Robert Boyle (1627-1691) on the left, with his famous formula together with an illustrative graph on the right. Boyle’s Law, first published in 1662, states that for an enclosed volume of gas the pressure varies inversely with the volume while the temperature is kept constant.

A Tiki Tour of New Zealand #2

The New Zealand Post issued on 4 July 2012 a beautiful sheetlet for the second of the Tiki Tour series. And the stamp located right in the centre of the sheet features a scuba diver, calling the tourists' attention to the great dive spots located in the Abel Tasman region, along the northern coast of the south island. The sheet is broken up into 3 parts to make a set of 3 FDCs.

Brazil 2012 Rio +20 UN Conference on Sustainable Development

As host of the Rio +20, the UN Conference on Sustainable Development, Brazil issued on 1 June a souvenir sheet, a postcard, and a sheetlet of 24 stamps, shown above, to mark the event. The last stamp on the sheetlet, at the bottom right corner, probably depicting eco-tourism, features a scuba diver facing off a whale.