From BCRC (British Cave Rescue Council) media briefing note 5 July:
"Yesterday, our officers concentrated their combined efforts to support our colleagues overseas. On around 07:00h BST (UK) time, Wednesday, a request was made from our team in Thailand and the Thai authorities, to send out additional personnel and equipment."
"Last night and later this morning, five key cave rescuers will travel from the UK to Thailand. Some are divers, others will perform a co-ordinating, surface control function."
"At this time, we are not able to give any specific updates on matters underground in Thailand. We are aware of a new initiative to divert streams and rivers from any inlets identified above the cave (sinks and fissures) to reduce the underground water flow rate. This is established practice in cave rescue and has proven effective in cave rescue efforts associated with other river caves, not least for Ogof Ffynnon Ddu (OFD) main streamway in South Wales when cavers become trapped underground during flood. At Tham Luang Nang Non Cave, surface searches continue for alternative routes in to the cave."
Tham Luang Nang Non Cave, Thailand – Update – British Cave Rescue Council