No wonder!
Judging by the depth, even a piece of iron would be crushed into pieces by the water pressure. However, their lotus bud could somehow withstand it. Though it looked soft, it did not break at all.
The bud was currently controlled by the two young mermaid ladies. They seemed to be very relaxed while maneuvering the lotus bud.
Gu Xijiu had a sudden thought. Two years ago when Di Fuyi had brought her into the deep sea, the bubble he created was somehow similar to this lotus bud. Perhaps the building in the deep sea had been built by the mermaids?
She was doubtful, and so she asked, "Did you learn your bubble transport technique from them?"
Di Fuyi answered her with a serious face, "I am the one who taught them this technique!"
"Don't brag!" Gu Xijiu did not believe him. "Didn't they come out from the sea in the past?"