Baby Elephant Seal on Beach Saturday By Lloyd Kahn on March 19, 2017 Marine Mammal Center was on its way. Relevant factoids: 1. Typical males are 16′ long, weigh 3 tons. 2. They can hold their breath for 100 minutes and typically dive 1,000 to 2,000 feet. 3. They propel themselves up to 5 mph by using their tail fins.