Members of the Hornafjörður rescue team near Jökulsárlón in eastern Iceland had to hurry to get the tourists to safety as quickly as possible, as it was likely the berg would roll over and plunge them into the freezing water.
A spokesman for the rescue team said the four American tourists set up a table and chairs on an ice floe along the shore of the lagoon, and prepared to eat dinner.
But a gust of wind pushed the ice floe out into the lagoon, leaving them stranded more than 10 metres from the shore.
One of the tourists managed to jump to shore before the ice drifted too far, and called the rescuers.
“When we arrived it was quite comical to see them sitting on chairs and with a table on an iceberg ... Yes the dinner was over,” said one of the rescuers.
He added he didn’t notice what they were eating because he was too busy getting life vests to them.