Going out on a limb here but offhand I'd say the engine was toast. I know the Camry's had a problem with the head bolts but the only region of the engine where the oil pressure exceeds the coolant pressure is internal. We're talking the block.

Water/coolant in the oil is usually head gasket but 95% of the time, oil in the coolant is a cracked block.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now