Depor were losing 1-0 at Almeria when Aranzubia jogged upfield for a corner in the fourth minute of stoppage-time.
He had ventured forward once already, to lend his presence in the penalty area to a Depor free-kick but it came to nothing and he was forced to scramble back to his own area.
"You don't practise these moves. It's a question of luck and sometimes it comes off," he told Spanish radio.
"I've been up before but I've never scored a goal. I did what I have seen my team-mates do and tried to copy them the best I could.
"My coach was happy for me and for the point we won."
"For them to score against you in this way, when the team has done everything to win, is a killer," he said.
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