1 Adam: I think I know why we're having no luck getting so much as a second glimpse of the Loch Ness Monster.
2 Jamie: Because it's a huge, deep lake with low visibility due to the heavy peat content?
3 Jamie: Because we're looking from just one shore location? Because, heaven forbid, the monster doesn't exist?
4 Adam: We haven't built a scale model of the Loch!

Peat is partly decayed vegetable matter, often associated with bogs and wetlands. The area around Loch Ness is particularly boggy and peaty, and the tannins and other chemicals, as well as particulate matter from the peat leach into the lake, making the water rather murky. This is part of why it's so hard to search for any evidence of large animals in the loch.

The loch water could, however, possibly be used to make a particularly peaty scotch whisky.^[1]

[1] Or not. It may be that the distinctive flavours and aromas of peat are infused in some other way than simply using murky loch water when making your whisky.