未经设区的市级以上网信部门、公安机关批准或者行业主管部门、运营者授权，任何个人、组织不得对网络安全等级保护第二级（含）以下的网络开展网络安全漏洞探测、渗透性测试等可能影响网络安全的活动。
"We can raise it up again after a year to change the batteries. That means we can avoid using divers, which is a really risky operation that we wanted to avoid," he said.
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endSync() { closed = true; return totalBytes; },