Ferries from Shenzhen (Shekou) were canceled, as well as from Hong Kong. Travelling from Pearl
River Delta to Haikou by sea is becoming more and more difficult. The only remaining solution was from Guangzhou, but it has been canceled too. Now, you only can go from
an harbour called Nansha - 2 to 3 hours drive from Guangzhou, no direct bus, difficult to find...
From Shekou, you only can go to Hong Kong, Macau or Zuhai.