You can dry things out, but seawater is really corrosive. After several hours or days spent in such environment, I wouldn't bet on any normal electronics workin

You can dry things out, but seawater is really corrosive. After several hours or days spent in such environment, I wouldn't bet on any normal electronics working. SpaceX experimented with catching spent fairings above water precisely because they wanted to avoid any contact between seawater and internal electronics of the fairing. At the end of the day, they reinforced the fairings electronics against water intrusion (AFAIK?) and this proved to be more economical than catching the fairings with a net, but Chinese airborne spying devices are unlikely to be as hardened against seawater intrusion as SpaceX fairings.