Possible Clues:

• Volcano that famously erupted in 1883
• Indonesian volcanic island with a massive eruption in 1883
• A cracker reportedly next to a volcano
• Indonesia island, volcano
• Mount that erupted in 1883
• Site of 1883 eruption
• Volcanic island between Java and Sumatra
• Indonesian caldera
• Briefly take old vessel back round a volcanic island
• The eruption of this island in 1883 is believed to have made the loudest noise ever heard by humans