Pity it doesn't show a mast or sail, but the high bow and stern suggests sea going ability.

I'm still amazed at the craftmanship of stone-age people, to build boats without steel tools is nothing short of amazing. They did have one advantage over us though, access to good timber, massive oak trees with long knot-free trunks.

We have been around for perhaps 150,000 years, if sea-going boats could have been built 4000 years ago, then they could have been built at any time during that period.