One by one:
It’s worth noting, though, that there are large differences between the ferry operators as well. National operator Pelni hasn’t had a boat sink since 1981, despite plying all year around all around the backwaters of Indonesia. The large car ferries (Sumatra-Java, Java-Bali, Bali-Lombok) are also pretty solid. It’s the small speedboats plying off the beaten track in bad weather that are most likely to kill you.
Last but not least, if you’ve only got 10 days, just how many islands were you planning to visit? You could easily spend all that time on say Bali alone, and 10 days to get through even Java and Bali would be pretty rushed in my book.
Credit:stackoverflow.com‘