hadal

adj.

超深渊的，离海面6000米以上深水中的；

The hadal community, an introduction ☆
Hadal trenches: the ecology of the deepest places on Earth
Death of a hadal deep-sea bacterium after decompression
Zoogeography of the Abyssal and Hadal Zones
The systematics and biology of abyssal and hadal Bivalvia
Liparid and macrourid fishes of the hadal zone: in situ observations of activity and feeding behaviour.
Vertical zonation patterns of scavenging amphipods from the Hadal zone of the Tonga and Kermadec Trenches
The deepest chemosynthesisbased community yet discovered from the hadal zone, 7326m deep, in the Japan Trench
Dual symbiosis in a cold seep thyasirid clam Maorithyas hadalis from the hadal zone in the Japan Trench, western Pacific
Vertical distribution of meiobenthos in the sediment profile in bathyal, abyssal and hadal deep sea systems of the Western Pacific