securely

Holmes edged his way round the wall and flinging the shutters together, he bolted them securely.

The young man obeyed, mounted on the table, and, divining the wishes of his companion, placed his back securely against the wall and held out both hands.

Descending into the grotto, he lifted the stone, filled his pockets with gems, put the box together as well and securely as he could, sprinkled fresh sand over the spot from which it had been taken, and then carefully trod down the earth to give it everywhere a uniform appearance; then, quitting the grotto, he replaced the stone, heaping on it broken masses of rocks and rough fragments of crumbling granite, filling the interstices with earth, into which he deftly inserted rapidly growing plants, such as the wild myrtle and flowering thorn, then carefully watering these new plantations, he scrupulously effaced every trace of footsteps, leaving the approach to the cavern as savage-looking and untrodden as he had found it.

These majestic stone structures securely housed the crucial new subterranean sewer lines while fortifying the muddy banks of the great river against relentless tidal erosion.