From Halopedia, the Halo wiki
During the onset of the Onyx Conflict in late 2552, they were competing with Team Saber and Team Gladius for top honors. Soon after, the team ventured into Zone 67 and were gravely wounded under unknown circumstances. They were discovered by Huragok tending to the facility and placed in suspended animation in slipspace field pods, as their injuries were too extensive for the Huragok to repair. Later, their pods were discovered by Dr. Halsey, CPO Mendez and a group of surviving Spartans, who took them into the Sharpened Shield. Team Katana was given medical aid immediately after the shield world was lifted out of its slipspace bubble and the survivors were rescued.
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