Zhao Hai knew that it was impossible for anyone else to notice these people. Although they were all level nine experts, they were hidden in shells and did not reveal any aura. Moreover, the shells were buried at the bottom of the sea. If Zhao Hai did not have surveillance cameras, he would not have been able to notice these people.
However, Zhao Hai didn't understand what the magic array was for. For safety's sake, he sent Laura and the others back to the medium. No matter what happened, they couldn't do anything to him. He could crystalize himself, so those people couldn't move. In addition, there were so many undead creatures around him. Although they were only at Level 5 or 6, they could transform into level 9 experts at any time. With so many level 9 undead creatures around, they could take care of those level 9 experts. Wasn't it still easy?
