These two fine caves in the Lam Khlong Ngu National Park, Kanchanaburi, will be open to visitors between 29 February and 4 May 2020. Visitors must pre-book, should be between 15 and 60 years old, able to swim and physically fit.
Bookings for groups of up to 10 will be taken between 13:00-15:00 hrs from 3 to 7 February 2020. The news report in English (https://www.asiaone.com/lifestyle/prime-chance-see-thailands-thrilling-kanchanaburi-caves) forgets to include the contact details, but in 2019 the registration phone number was 082 - 247 – 3352, while for enquiries contact 084 - 913 – 2381 or e-mail  regis.lamkhlongngu@gmail.com