Longest submergence underwater in a controlled environment

Longest submergence underwater in a controlled environment
Who
Michael Stevens
What
212.30 hour(s)
Where
United Kingdom ()
When
The continuous duration record (i.e. no rest breaks) for remaining underwater using breathing apparatus, is 212 hr. 30 min., by Michael Stevens of Birmingham in a Royal Navy tank at the National Exhibition Centre, Birmingham, England from February 14-23, 1986.