Data from: Tireless travellers: Sea turtles swim continuously during long-distance movements

While rest and sleep are crucial to animals, our understanding of whether
and how long-distance migrants rest has been thwarted by the inability to
relay high-resolution data from multi-channel loggers via satellite. We
overcame these obstacles for an iconic long-distance migrator by equipping
five loggerhead sea turtles (Caretta caretta) with satellite tags and
data-loggers providing depth and 3-D acceleration measurements. Turtles
were translocated to open-sea locations and induced to complete oceanic
migrations of tens of km to return to their nesting beach performing
active, oriented movements. Across a total of >600 hours of
high-resolution data, we observed (i) constant flipper frequency (ca. 0.5
Hz) indicating that turtles never ceased movement, (ii) intense subsurface
swimming (mostly around 1 m) for about 50% of time and (iii) deeper, less
active dives up to 80 m, which were made day and night and more frequently
in offshore waters. Flipper beat amplitude was much smaller in deep dives;
hence the estimated energy expenditure was 37% lower on deep dives
compared to subsurface swimming. These findings suggest that turtles,
which can complete migrations of >2000 km, alternate between phases
of intense near-surface swimming and periods of lower activity at depth,
without fully resting during migration.