I just watched the full video. Here's a summary. Some of this has been posted already, but I'll just recap more or less in order of the video.
The boat was slightly tilted at boarding but the crew somehow stragihtened it out by the time they left the harbor. There was a security briefing that mentioned an escape hatch. The windows in the cabins were too small to fit through and few even opened. There were life vests underneath the beds, but very basic ones. The guests felt a bit uncomfortable when questions about other safety features such as O2 and a defib on board were not answered (presumably the crew didn't understand). The briefing included info about the life rafts (2 on board) for 25 people each. There was no emergency drill however.
They had been diving a full day with no problems. At night one of the people in the video woke up at 4am and felt the boat was heavily tilted. Looking out through the window everything seemed ok though. So he went back to bed. At 5h30-ish they went out for the first dive, came back for breakfast and the boat was so far tilted that chairs slipped and plates slid off the tables. The crew kept finding excuses. They left their dive site for Ras Mohammed and the boat straightened out again until it started tilting to the side, then to the other. Back and forth a bit until really tilting over for good (other side as in the morning and at harbor). At this time most of the guests were on the sun deck (first floor so to speak), 3 people were in their cabins below deck, a small group was inside the salon. The group in the salon was hit by everything sliding. Nothing except the tables was screwed to the floor or walls. Of the larger group on the sun deck some fell off board into the sea and quickly drifted off (later collected by a zodiak that was partially leaking though). The group below deck was one very experienced diver and a father and son duo. They checked all the cabins and made their way to the escape hatch only to find it closed. So they went back toward the starcase which was usually winding to the right side but now the opening was pointing upwards. No railing. The experienced diver lifted the 20-something kid up on his shoulders and pushed him out. Then he did the same with the dad and told them to leave the boat. It was only much later that he somehow managed to get out of there and had to dive out through the salon where luckily there were some air pockets. He swam out to the open sea only to find that he was left alone. Luckily he was later spotted and rescued. In the meantime the life rafts were launched. One was upside down and unusable. The other one ended up holding everyone. During this whole time nothing was done by the crew, except for a dive guide who collected the people who fell into the water with the zodiak (one had also fallen into the sea but seemed otherwise helpful). The rest of the crew were not helpful, some couldn't swim, and most shockingly, the captain did nothing, not even save the passports or check if everyone made it out. Eventually another liveaboard picked everyone up. It sounds as though the captain had not sent an SOS. The other LOB radioed the sinking ship and got no reply which is why they came. The crew from that boat was apparently very nice and professional. They found a doctor on another nearby boat who could stitch up some wounds. The marine picked up the divers and crew eventually. Two were brought to a hospital, the rest to a shabby hotel which was switched to another one the next day. The rest is an odyssey of getting some money, passports, stamps and whatnot. The company was not helpful and, yes, told them they had no insurance. The gofundme was set up to help the less fortunate ones, among them dive instructors who obviously lost their gear... And they want to sue the company.