Shuká Káa lived on an island.

He ate a diet dominated by marine protein.

He was, by the chemical evidence of his bones, a maritime person in the fullest sense.

All of this implies the existence of watercraft — without boats, an island-dwelling, marine-diet-dependent person simply cannot exist.

The specific watercraft used by the early coastal peoples of the Alexander Archipelago are not directly documented in the archaeological record.

Wood — the most likely material for boat construction in a forested coastal environment — does not typically survive for thousands of years in open-air contexts, and the cave environments that preserve bone do not typically preserve the large wooden structures of watercraft.