As no one needs to know about safety, and there is no airport rescue boat (due to costs), this is some information about the need for water rescue craft relating to another airport:
"🛟 Summary
Period Rescue Boats Available
January 1982 1 official rescue boat (ineffective)
Post-crash Multiple boats added, better equipped, strategically placed
The Air Florida Flight 90 tragedy showed that one boat was not enough, especially in winter conditions, and helped usher in broader investment in urban water rescue capability across the U.S."
Pre-crash there was one boat, post-crash there are 5. In the more recent accident at that airport, the first rescue boat got there in 10 minutes.
The Wikipedia entry gives some harrowing details about the lengths some people went to to try to help survivors.
But in the IoM. it's all about the money.