Blue Lagoon 3:30 dolphin encounter but final ferry leaves at 4:00?

I've called Blue Lagoon in the past without issues but tried calling today and the call wouldn't go through. I emailed them but they still weren't exactly clear so I'm hoping to get the answer here. Ship is in port until almost midnight so missing the ship isn't an issue. If one was to book the 3:30 dolphin swim but the final ferry is 4:00, how do the 3:30 people get back? This is the response I got from them in my email-

If they are booked for a 3:30 they can come to the island earlier (depending on the time their ship comes into port) to spend time on the beach before their program, which will begin at 4:00 and they will get back at 6:30.

So is there a secret ferry at 6:00 only for the 3:30 dolphin guests?

We had a similar issue. Our port times were 12-7. I was worried we would get to the island at 1:30 and have to leave at 3:30 or 4:00. They offered a special ferry at 5:30 for people on our cruise ship. I'm sure they will do something similar for you.

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We did a ship's excursion, which was good. For this excursion, the ship's excursion is best.