Enhancing　critical　heat　flux　(CHF)　and　heat　transfer　coefficient　(HTC)　by　promoting　the　nucleation,　growth,　and　departure　of　boiling　bubbles　has　drawn　significant　attention　owing　to　its　wide　applications.　However,　in-depth　understanding　and　comprehensive　manipulation　of　under-liquid　bubble　dynamics　from　in　situ　microscale　perspectives　remain　challenging.　Herein,　in　situ　observations　and　analyses　of　the　microsized　boiling　bubbles　of　ultra-low　surface　tension　fluorinated　liquids　(FLs)　are　conducted　on　the　superaerophobic　silicon　surfaces　with　crisscross　microchannels　and　selective　nanowires.　It　is　revealed　that　deep　microchannels　yet　short　nanowires　enable　ultrafast　liquid　spreading　(　©　2025　Wiley-VCH　GmbH.