Most people extreme ironing underwater

According to Official Guinness Records,

The most people extreme ironing underwater is 173 and was achieved by de Waterman Diving Club (Netherlands) in Oss, Netherlands, on 28 March 2011.
Ironing lasted 10 minutes.

For a complete list of 2011 records, please visit 2011 Guinness Records in Netherlands.

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Other Netherlands records that might interest you:

• Most appearances in an international hockey career (male)
• Longest gaming session in indoor freefall
• Longest Christmas stollen
• Fastest road run 15 kilometres (male)
• Most simultaneous games of international draughts by an individual