No sir you cannot marry without legal divorce it offence under ipc 494 bigamy as well as your second marriage shall be void.
you can keep it a secret but your second wife won't have any rights first can claim all property legal rights after death. Further if she never shows up good for as no criminal case will be Filed by her but marriage won't be valid in eyes of law.
Further if she show up she can prosecute you for bigamy and you can be punished further your second marriage shall be void.
Try contacting your wife take her consent for mutual divorce if she agree you can take a mutual divorce if not you have to file a divorce on ground of cruelty and desertion under section 13 HMA