The Grotto has claimed the lives of at least 6 to 10 divers since 2001, with deaths in 2005, 2006, 2008, including the deaths of students, advanced divers, instructors and dive masters.
I don't want to be responsible for a case of "monkey see monkey do". If you are planning to dive here - DO NOT SWIM OUTSIDE like I did. It's not about the distance or breath hold, its about the conditions outside. I swam out once, and I will never swim outside again. This video is edited to make it look like I was outside for a few seconds - the reality is I was stuck outside for around 10 minutes, with big waves pounding the cliff wall making it impossible to 'breath up' on the surface before going back in. Once you surface on the outside, its impossible to see the entrance to the grotto without first swimming down to about 6 or 7 meters. If the waves and current move you out of position just a few meters , you may never find your way back in. If you are stuck on the outside of the cliff, you'll have to make a 1.5km swim in fierce currents and pounding waves to make it to shore.
Also be aware that the exceptionally clear water gives you a false perception, and you may find you are way deeper and further into the cave than it looks.
I don't want anyone to kill themselves because of what they saw somebody do on youtube.