Each team spent 15 days in the habitat, but aquanaut/former astronaut Scott Carpenter remained below for a record 30 days. In addition to physiological testing, the 28 divers tested new tools, methods of salvage, and an electrically heated drysuit. They were aided by a bottlenose dolphin named Tuffy from the United States Navy Marine Mammal Program. Aquanauts and Navy trainers attempted, with mixed results, to teach Tuffy to ferry supplies from the surface to SEALAB or from one diver to another, and to come to the rescue of an aquanaut in distress. When the SEALAB II mission ended on 10 October 1965, there were plans for Tuffy also to take part in SEALAB III.