HUMANS could live in underwater cities and hack our own biology for super hero abilities, according to a multi-millionaire who wants to put a chip in your head. 

HUMANS of the future could have enormous lungs to live in underwater kingdoms, or biohacked brains where memories can be bought and sold for a fee. 

That's according to two experts in pushing the human body to its limits discussing what "humans 2.0" will look like.

Speaking at Lisbon's Web Summit on Tuesday, Kernel founder Bryan Johnson said unlocking the potential of our brains is the "single greatest thing" humanity can strive for.

The former door-to-door salesman who founded payment company Braintree and sold it to eBay in 2013 for $800 million has now invested $100 million of his own cash in Kernel, an LA based start-up making microchips inserted in brains to read and write neural code. The plan is to use them to fight disease first before progressing to unlocking human superpowers.