Dolphins are incredibly skilled and versatile swimmers, and they can dive to impressive depths. The maximum depth that dolphins can reach varies depending on the species. Here are some general guidelines:

1. Common Bottlenose Dolphin: The common bottlenose dolphin (Tursiops truncatus), one of the most well-known dolphin species, can dive to depths of around 300 to 700 feet (91 to 213 meters). However, they typically prefer shallower waters and may spend most of their time in depths of 30 to 200 feet (9 to 61 meters).
2. Spinner Dolphin: Spinner dolphins (Stenella longirostris) are known for their acrobatic spinning leaps out of the water. They often dive to depths of around 650 feet (200 meters) in search of food.
3. Short-Beaked Common Dolphin: Short-beaked common dolphins (Delphinus delphis) are known to dive to depths of around 900 feet (274 meters).
4. Long-Finned Pilot Whale: Long-finned pilot whales (Globicephala melas) are actually members of the dolphin family. They are known to dive to depths of over 3,280 feet (1,000 meters).

It’s important to note that these depths are approximate and can vary depending on factors such as the availability of prey, environmental conditions, and individual behavior. Dolphins are highly adaptable and can adjust their diving behavior based on their needs and surroundings.