Answer:
The answers is explained below.
Step-by-step explanation:
20,000 Leagues Under the Sea is a book written by French author Jules Verne and it narrates the story of Cptn. Nemo and his submarine, the Nautilus.
1) Site of two shipwrecks - Vanikoro.
2) Commander of the La Boussole - La Perouse.
3) A coral tomb - "a fine death for a sailor."
4) Entrance to the Indian Ocean - Straits of Torres
5) The Nautilus runs aground - an incident.
6) Island where Aronnax and friends are allowed to go ashore - Gilboa.