I am planning to do a Balkans trip in October 2021 and in Montenegro I plan to do an Our Lady of the Rocks and Blue Cave (aka Blue Grotto) tour. The tour includes an optional 20 minutes of swimming/snorkelling.
Now I am an okay swimmer. I know how to swim and did learn to swim and can also swim in the deep end of a swimming pool but I do not swim/practice swimming often. I have not swam for a year.
How difficult do you think it would be for me to swim given that I have not swam for a year and do not practice often?
Similarly, in my situation, how difficult do you think it would be for me to do snorkelling?
Also, how deep is the water?
In relation to this, the only wild swimming outside of swimming pools I have done is in the Kuang Si Falls in Laos. I have never swam in any caves, rivers, lakes or oceans.