To begin with, the manoeuvre went to plan and Roosa perfectly aligned the probe at the tip of the command module with the hatch on the lander. But when the two spacecraft were pushed together, the latching mechanism failed to engage. With the crew getting increasingly concerned about the very real possibility of the mission being aborted. It wasn't until the sixth attempt, nearly two hours later, that the latches finally locked to achieve a "hard dock". (You can read Nasa's original report into the problem here.)

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