Manado Tua, meaning "old Manado", is a dormant volcanic island lying north of Bunaken Island. The video opens with the swim-throughs at Alung Banua on Bunaken Island itself and footage from the dive site of Mandolin. We then visit Negeri and Bualo on the southern coast of Manado Tua where we meet a bearded scorpionfish, a Bunaken trademark golden sea squirt with a Phyllidiella pustulosa wart sea slug, a Chromodoris dianae nudibranch and a gold-speckled flatworm.