What is the first problem in Apollo 13 mission?

The first major problem in the Apollo 13 mission occurred when an oxygen tank in the service module exploded on April 13, 1970, just two days after launch. This explosion severely damaged the spacecraft's systems, leading to the loss of electrical power and the failure of life support systems. The crew, consisting of Jim Lovell, Jack Swigert, and Fred Haise, had to quickly devise a plan to conserve resources and return safely to Earth.