The ED has unearthed a massive forex scam of over Rs 700-crore involving Capstone Forex Private Limited, a Maharashtra-based firm. Capstone Forex came under ED's scanner. The financial probe agency claims that Capstone Forex bought forex on fudged, forged and fake air tickets and passports. ED's investigation has revealed that Capstone had received more than Rs 700-crore in its accounts from various shell companies.