Where does “βαθυσκάφος” come from?

βαθυσκάφος (Greek) comes from Greek βαθύς, from Ancient Greek βαθύς, from Proto-Indo-European gʷeh₂dʰ- — to sink, submerge; to tread, wade.

βαθυσκάφος (Greek): bathyscaphe, bathyscaph

Definitions

βαθυσκάφος traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Greek	βαθύς	deep; deep, dark; profound, deep
2	Ancient Greek	βαθύς	being a large vertical distance from: high, deep;...
3	Proto-Indo-European	gʷeh₂dʰ-	to sink, submerge; to tread, wade

Step	Language	Word	Meaning
1	Greek	σκάφος	hull; craft, vessel, ship
2	Ancient Greek	σκᾰ́φος	hull of a ship