President Mohamed Nasheed will chair the meeting on October 17 ahead of the world climate change summit in Copenhagen in December, a spokesman told AFP from the islands' capital, Male.
He said the 14-member cabinet were taught scuba-diving basics over the weekend. Nasheed was not present as he is already a certified diver.
"The cabinet will don wet suits and scuba equipment and dive to a depth of six metres (20 feet), where a special meeting of the cabinet will be convened," the spokesman, who declined to be named, said.
"They will then ratify a pledge calling on other nations to slash greenhouse gas emissions ahead of the Copenhagen meeting.
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Cabinet members will communicate using whiteboards and hand signals.
The Maldivian archipelago, located south west of Sri Lanka, is on the front line of climate change and has become a vocal campaigner in the battle to halt rising sea levels.
In 2007, the UN's Intergovernmental Panel on Climate Change warned that a rise in sea levels