Beebe continued to conduct marine research after 1934, but he felt that he had seen what he wanted to see using the Bathysphere and that further drives were too expensive for whatever knowledge he gained from them to be worth the cost. With the help of Beebe's friend the physician Henry Lloyd, Beebe conducted an expedition in the West Indies examining the stomach contents of tuna, which uncovered previously unknown larval forms of several species of fish. Shortly after returning, Beebe set out on a longer expedition to the waters around Baja California, financed by the Californian businessman Templeton Crocker on board his yacht the "Zaca". The goal of this expedition was to study the area's undersea fauna utilizing dredging and helmet diving, and Beebe and his team were surprised by the diversity of animals that they encountered there. In 1937 Beebe went on a second expedition aboard the "Zaca", documenting the native wildlife along the Pacific Coast from Mexico to Colombia. During this expedition, rather than focusing on either sea animals as he had at Nonsuch Island or on birds as he had earlier in his life, he attempted to document all aspects of the ecosystem. Beebe described his two expeditions onboard the "Zaca" in his books "Zaca Venture" and "The Book of Bays", in which he emphasized his concern for threatened habitats and his dismay at human destruction.