The sea is a human-unfriendly place. It is hostile and an uncomfortable place to be → You need a tool that enables you to be there; if there were no boats you could not access it.
We are not meant to be in the ocean. It is an alien medium for us. We cannot exist there. To be able to be there we have to be able to swim or we have to use something that is external to our bodies. Going to the ocean is like going to the moon.
Just being on the ship is work. Humans are not made to live on the sea – we are made to live on the shore. We’re handicapped at sea.