<https://finland.fi/life-society/helsinkis-renovated-olympic-stadium-launches-into-a-new-era/#primaryimage>
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"The Olympic Stadium’s new, wooden, fire-resistant roof uses Finnish spruce and pine, and covers the 36,300 seats, replacing the benches that previously filled the stands. For concerts, capacity can be extended to 50,000."
<https://finland.fi/life-society/helsinkis-renovated-olympic-stadium-launches-into-a-new-era/>