Choosing how to get about

People have travelled by boat for thousands of years. They may not be fast but they are an affordable way to cross the sea and carry large cargoes.
Many people enjoy sailing, or using jet skis. They are a healthy and safe form of recreation.

But....

There have been some really bad ferry disasters in the past with hundreds of peole being killed. Even with modern radar and navigation, tankers can run aground and release thousands of tonnes of oil into the sea.

So what are the facts?