Zealandia is half the size of Australia & surrounds New Zealand. It's an actual continent.
Read the article (link on photo caption)—it's interesting but I can't boil it down. I guess file this post under gee-whiz-science that I am interested in knowing exists but not so interested that I want to learn more.
October 3 Update The scientists are back & excited: https://www.nsf.gov/news/news_summ.jsp?cntn_id=243192&WT.mc_id=USNSF_51&WT.mc_ev=click