India reached a new Test milestone in the latest humiliation of England as they recorded their highest total in the game's longest format.
The hosts went into the fifth and final Test having already clinched the series after taking an unassailable 3-0 lead, but piled more misery on England on day four in Chennai.
Virat Kohli's men started the day on 391-4 in response to England's first-innings score of 477, with Karun Nair on 71 not out.
And India continued to show utter disdain for England's bowling attack, Nair starring with a magnificent performance as he surpassed 300.
Nair took India past their previous record score of 726 - set in Mumbai against Sri Lanka in 2009 - by lashing a four through the covers.
He then brought up his triple century with a cut shot from Adil Rashid, following Virender Sehwag as only the second India player to go past 300, before the home team declared on 759-7, the highest Test total conceded by England.