The buzzing roar echoed through the tunnel.
Thanks to the tunnel's empty chamber effect, the sound produced a response and resonance, making it particularly clear.
This sound was undoubtedly that of an aircraft.
I quickly ran out of the tunnel and looked up at the sky.
Through the gaps in the trees, I saw a multipurpose seaplane circling above the island.
From the model, it was a "Loong" seaplane from the East, an incredible aircraft with a range of over 2,500 miles.
Combined with a gliding search method, this plane could easily take off from land, search the sea, and then return.
If equipped with auxiliary fuel tanks, it could stay airborne even longer.
After circling in the air for a moment, the seaplane flew off into the distance, continually lowering its altitude.
Judging by i
