The phrase "reach below" is correct and can be used in written English.
It is typically used as a command or instruction, instructing someone to physically reach or extend their hand or arm below something. Example: "Please reach below the counter and grab a towel for me."
Nowadays, we need things that shimmer on the surface and have tendrils that reach below so you can see to a certain depth".
It also seems somewhat anemic since it immediately follows an exhibition, "Steel, Stone and Backbone," that examines the subway's construction during the early decades of the 20th century, when 30,000 men were extending the city's reach below ground as others were propelling it skyward.
Between the 6th and 8th week of embryological life, the ventral bud rotates behind the duodenum to reach below and behind the head of the dorsal pancreas.
Start 45cm from the trunk and dig a trench around it so you can reach below to undercut the roots.
The temperature in cold box can reach below 200 K and the temperature drop in the refrigerator has exceeded 80 K.
The first-order loss rate of parent triclosan from the water column was calculated from measured data (0.06 h−1) and this rate corresponded to a 76% reduction in triclosan over an 8 km river reach below the discharge.
Neither XM nor Sirius can reach below-ground parking areas; the ability to handle obstructions like tunnels depends on where each has been able to erect "repeaters," land-based antennas that help keep a signal strong.
But they drove me nuts in the beginning, as my thumbs instinctively reached "below" the bump (where there's nothing to press).
The algal cell concentration in the systems never reached below 5,000 cells ml-1.
If the finger tips remained above the platform the distance was recorded in negative numbers, if they reached below platform as positive number.
The results showed that, after 70 minutes, pO2 reached levels below 10mmHgg (pO2 70 minutes: 9.00±0.58 mmHg).
