Most nationalities in a hot tub
Who
Backstreet Boys, Inc
What
30 people
Where
Italy (Mediterranean Sea)
When

The most nationalities in a Jacuzzi is 30 and was achieved by The Backstreet Boys (USA), their fans, and Rose Tours (USA), on board Royal Caribbean's 'Brilliance of the Seas', on the Mediterranean Sea, on 13 May 2016.

The nationalities were:

Argentina

Australia

Belgium

Chile

Costa Rica

Denmark

France

Germany

Guatemala

Holland/The Netherlands

Hungary

Israel

Ireland

Italy

Japan

Latvia

Mexico

New Zealand

Norway

Pakistan

Peru

Poland

Romania

Switzerland

The Philippines

USA

Uraguay

Uzbekistan

Venezuela

Cuba