However, such a link would require expensive tunnelling under London, and was costed in July 2008 at £4.5bn.

When boom injuries occur far from shore they can require expensive rescues.

Larger designs would require prohibitively expensive dredging on harbors and channels and new docks.

In Baran's words, unlike the telephone company's equipment, his design didn't require expensive "gold plated" components to be reliable.

Even experienced surfers can be seriously injured on the violent waves, and the remote location requires expensive rescues via helicopter.

Dynamic address translation required expensive and difficult to build specialized hardware; initial implementations slowed down access to memory slightly.

At a sacrifice of forward visibility, the biplane did not require expensive, drag producing support wires.

Provinces, meanwhile, are already fighting over how the water will be shared, because some of the delivered waters will require expensive cleansing.

Many machines require very expensive cooling, maintenance and calibration for proper use.

Maintenance costs are higher for old planes, and many require expensive refitting to comply with the pending tightening of Federal noise regulations.