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Get your data out
Your diving history is yours. Two ways to take it with you, both under Settings → Account settings → Export Data.

The full export
Export Data packages everything — dives, equipment, certifications and documents — and emails you a download link. The link is valid for 48 hours, after which the file is permanently deleted.
The email warns you of the one thing that matters: anyone with that link can download the file, so don't forward it around.
The PDF logbook
PDF Logbook generates the thing you can print or hand over: your logbook as a document.

It opens with a cover page in your name, then your diver profile with your certifications and equipment, then a page per dive with the full detail — conditions, gas, wildlife, buddies and the dive centre.
It's the format to use when someone wants your logbook on paper: a dive center before a course, or an insurer.