Ordered the shared tour with hotel pick up/drop off as a solo traveller. While the itinerary specifically indicated guided tour to Liberty Wreck at 10am, the local operator later clarified that there is no snorkeling guide as I didn't choose the option with snorkel. It baffled me because both the snorkel and no snorkel options show guided tour to the wreck, there was no mention anywhere about the presence/lack of snorkeling guide, and the only difference in the itineraries between the two was the equipment rental, which I don't need as I already brought mine. In short, there is significant room for improvement in the listing.
I had given up on snorkeling as it is not safe to do watersports alone and at an unfamiliar place. Thankfully the driver Sarbuja saved the day by actively sourcing for a local snorkeling guide to bring me at a fee to the shipwreck site.
Sarbuja is also very knowledgeable about Balinese culture and I enjoyed the chats with him. Highly recommend Sarbuja.