Royal Caribbean has fully drawn down two of its revolving credit lines as the struggling cruise industry scrambles to stay in business while the coronavirus pandemic leaves ships empty and moored at docks across the world, the company said in a new securities filing. The company tapped $3.48 billion in backup financing between two revolving lines held by Nordea Bank and Scotiabank, Royal Caribbean said Thursday in a filing. The drawdown is another example of how Royal, along with peers Carnival Corp. and Norwegian Cruise, have sought cash infusions to remain solvent after the industry announced a suspension of operations due to the coronavirus pandemic. Shares of Royal Caribbean rose by more than 4% in morning trading before finishing the day down more than 3%. The stock has fallen about 80% since Jan. 1. Royal Caribbean had previously announced steps to bolster its finances. On March 23, the company said it entered into a $2.2 billion loan agreement with a consortium of lenders.