OPALA, Justice:

The dispositive issue is whether the trial court erred when it ruled that plaintiff's exclusive remedy for his personal injury is by a claim in the Workers' Compensation Court. We answer in the affirmative.

Raymond Newport [worker] was employed as an electrician for Oklahoma Steel Mill [Mill]. When the worker was unable to repair a large electric motor, the Mill contracted with Wilson Electric Motor Service, Inc. [Wilson] for such service. Wilson hired Crane Service, Inc. [Crane] to remove the motor from the Mill and transport it to Wilson's shop for repairs. While in the process of removing the motor, Crane's employee enlisted the assistance of the worker and of another Mill employee to guide the crane hook onto the top of the motor. During this activity, the hook disengaged from the cable and fell, knocking the worker from the top of the motor and causing him severe injuries. The worker brought a tort action against Crane and Wilson, alleging negligence of Crane's employee in failing to properly secure the hook. The trial court sustained the demurrers to the worker's petition. Judgment for both defendants was premised on the view that the worker's right of action against the contractors was abrogated by the provisions of the Workers' Compensation Act [Act].

The worker contends the defendants [Wilson and Crane] are independent contractors each of whom is engaged in business unrelated to that of the Mill and who, at the time of his injury, were performing tasks not to be regarded as "necessary and integral" to the Mill's day-to-day business under the test announced in Murphy v. Chickasha Mobile Homes, Inc. The import of this argument is that the defendants were not in the same statutory "employ" as the worker and are hence liable to him in tort for the injury.

The defendants counter that the worker's exclusive remedy is under the Act. They contend that since he was engaged with Crane for the Mill in a common task — the removal of the electric motor — he must be considered to be in the same employ. Their argument is that the "common task" test, announced in O'Baugh v. Drilling Well Control, Inc. is applicable here and provides the basis for their immunity from an action in tort.

Neither the Murphy "necessary-and-integral" nor the O'Baugh "common task" test is apposite to the facts of the instant case. These two tests govern factual settings dissimilar to that before us.

In Murphy, the plaintiff, an employee of an independent contractor, sought damages for negligence of the principal hirer, i.e. one who engaged the work of plaintiff's employer. The "necessary-and-integral" test was held applicable. That test serves only to determine whether the defendant-hirer is secondarily liable in compensation for injuries to the plaintiff-employee of a hirer's contractor. If the defendant is found not to be secondarily liable as a § 11 employer, he becomes a stranger to that section's employment scheme. As a stranger he is subject to the tort liability that stands preserved by § 44 to everyone who is "not in the same employ" as the injured worker. In O'Baugh, the defendant was found to be "in the same employ". There, the plaintiff, an employee of a subcontractor, brought an action in tort against another subcontractor who was working on the same drilling project for the same hirer. By the application of the common-task standard, the two contractors — doing a common task for the hirer — were found to be "in the same employ" and hence each of them became immune from tort liability in an action brought by an employee of either of them. Here the worker is the hirer's servant.

The alignment of the parties in the instant case closely resembles that in Dolese Bros. v. Tollett. There, a truck driver, while delivering material to a prime building contractor, injured the contractor's employee. The employee brought a tort action against the material supplier. The supplier claimed to be in the employment of the contractor and hence not subject to tort liability preserved by the Act to those "not in the same employ." The court held that neither in contemplation nor by the terms of the workers' compensation law was the supplier for the job transformed into a statutory employer of his hirer's work force. The injured employee of the hirer was found to be solely in the hirer's employ — not also in that of the hirer's supplier. Since neither at common law nor by statute was the supplier deemed to be the injured worker's employer, he was not under secondary liability for compensation to the hirer's employee and hence could not claim the shield of immunity from tort liability.

The tort immunity created by our compensation law extends beyond the confines of the common-law employer status. It ascends the full length of the statutory employment ladder and encompasses the immediate, intermediate and principal hirers of any entity in the § 11 chain, together with all their employees. Each of these entities is secondarily answerable in compensation. The liability runs in descending order and extends to anyone in hired activities which constitute a necessary-and-integral part of the hirer's business. The immunity fashioned by the law does not run down the employment ladder but rather in the opposite direction. It goes up that ladder. In the instant case, the immunity conferred by the Act upon the Mill — as the worker's immediate employer — does not descend to shield the defendants from liability in tort to an employee of the Mill. It is not the immunity from tort but rather the liability in compensation that is extended — downward from the hirer — in descending order. A hirer who occupies the principal employer's status — within the meaning of § 11 — is primarily liable in compensation to his immediate employees and secondarily accountable to the employees of all his contractors through whom the day-to-day activities of the hirer's own business are being performed. All other intermediate contractors in the employment chain that descends from the hirer — as the statutory principal employer — down to and including the immediate employer, are likewise answerable in compensation to their direct employees and to those of their own contractors who meet the "necessary-and-integral" test.

The defendants, Wilson and Crane, are not in the statutory employment chain with the worker. Because they do not qualify as his § 11 employers, they have no secondary liability to answer in compensation. They are not protected from having to respond in damages at law.

In his petition herein the worker stated that at the time of his injury the defendant Wilson was engaged by the Mill to repair an electric motor and that Crane, acting as Wilson's agent, was in the process of picking up the motor to deliver it to the principal's place of business. The worker unmistakably alleges that he was an employee of the Mill. None of the pleaded facts indicates that the defendants stand in the status of § 11 employers. Nor may that status be inferred from any allegation. Since secondary liability of a hirer is not applicable to the facts here, consideration need not be given to the impact of the "necessary-and-integral" test by which the law gauges the hirer's responsibility to an employee of an independent contractor on the job.

The defendants would be found within the orbit of exclusive liability in compensation only if, at the time of the accident, the worker could be claimed as a servant of another [the Mill] who was on loan to them. The worker's loaned-servant status is not alleged, nor may it be inferred from the terms of the petition.

The petition affords no foundation for the trial court's conclusion that the plaintiff's claim for his personal injury stands statutorily confined to the remedy in workers' compensation. The trial court's judgment for both defendants is accordingly reversed and the cause is remanded for further proceedings not inconsistent with the views expressed herein.

IRWIN, C.J., BARNES, V.C.J., and HODGES, LAVENDER, HARGRAVE and WILSON, J., concur.

SIMMS, J., concurs in result.