Whilst still in her trance-like state during egg-laying this female is being tagged.
Such tagged turtles have yielded amazing discoveries. Many of the larger Leatherbacks move into the North Atlantic to feed on Jellyfish even occasionally reaching sub-Arctic waters. A great many also reach the Celtic Sea where an ongoing study in Ireland has caught & tagged a few : http://www.coverack.org.uk/pages/leatherbacks.html . This research has even revealed that one of the Irish-tagged male turtles dived to an incredible 1280metres!!!

Clearly Leatherbacks must have special physiological adaptions to cope with cold water (both North-Atlantic waters & the cold Ocean depths). The metabolic rate of the leatherback is about four times higher than one would expect for a reptile of its size; this, coupled with counter-current heat exchangers, the insulation provided by its oily flesh and large body size, allow it to maintain a body temperature as much as 18°C (32°F) above that of the surrounding water. Its large size also gives the leatherback more capacity to maintain its body temperature than smaller, more ectothermic reptiles. They are also the fastest swimming reptiles on record. The 1992 edition of the Guinness Book of World Records has the leatherback turtle listed as having achieved the speed of 9.8 meters per second (35.28 kilometers per hour) in the water!