The writer wants to omit the underlined portion of the sentence provided here. How should this sentence be punctuated once that part is removed to indicate an omission has been made?
While most wreck diving sites are shipwrecks, diving to crashed aircraft or even submerged cars can also be considered wreck diving, and it’s a lot of fun to explore these underwater structures, but wreck diving can present some dangerous challenges and only experienced recreational divers should attempt a wreck dive.