I mean, anyone who was convinced otherwise was delusional. We've always known that methane has a substantially higher short-term impact on GHG emissions than carbon dioxide. We've also known for years now that natural gas is notorious for leaking obscene amounts of methane (even compared to coal mining per unit energy). That hasn't stopped us from tapping and consuming more gas: in fact, total US fossil fuel electricity production has increased by 40% over the plateau in the 1970s-2000s.
In the short-term, we are incredibly, incredibly fucked. Eventually, methane decays and whatnot, but that might be too little, too late.
The IDF built a network of tunnels for a bunker under al-Shifa hospital back when they occupied Gaza.