I was involved in a UK company that strung fibre optics along the high voltage transmission network to quickly build a national network, there was a ridiculous

I was involved in a UK company that strung fibre optics along the high voltage transmission network to quickly build a national network, there was a ridiculous amount of money flowing around hooking up companies, then there wasn't. I got out before it collapsed but you could see it was unsustainable. Later, due to my experience with the software involved, a colleague and I were tasked with recovering data from another huge firm that collapsed after the boom, walking into a massive empty office with a post it note with a server name and some passwords. Nothing on the db to recover but we had the skills to bypass the security.